Use SCEP certificate profiles with Microsoft Intune (2023)

After you configure your infrastructure to support Simple Certificate Enrollment Protocol (SCEP) certificates, you can create and then assign SCEP certificate profiles to users and devices in Intune.

For devices to use a SCEP certificate profile, they must trust your Trusted Root Certification Authority (CA). Trust of the root CA is best established by deploying a trusted certificate profile to the same group that receives the SCEP certificate profile. Trusted certificate profiles provision the Trusted Root CA certificate.

Devices that run Android Enterprise might require a PIN before SCEP can provision them with a certificate. For more information, see PIN requirement for Android Enterprise.

Create a SCEP certificate profile

1. Sign in to the Microsoft Endpoint Manager admin center.

2. Select and go to Devices > Configuration profiles > Create profile.

3. Enter the following properties:

   • Platform: Choose the platform of your devices.

   • Profile: Select SCEP certificate. Or, select Templates > SCEP certificate.

     For Android Enterprise, Profile type is divided into two categories, Fully Managed, Dedicated, and Corporate-Owned Work Profile and Personally-Owned Work Profile. Be sure to select the correct SCEP certificate profile for the devices you manage.

     SCEP certificate profiles for the Fully Managed, Dedicated, and Corporate-Owned Work Profile profile have the following limitations:

     1. Under Monitoring, certificate reporting isn't available for Device Owner SCEP certificate profiles.
     2. You can't use Intune to revoke certificates that were provisioned by SCEP certificate profiles for Device Owner. You can manage revocation through an external process or directly with the certification authority.
     3. For Android Enterprise dedicated devices, SCEP certificate profiles are supported for Wi-Fi network configuration, VPN, and authentication. SCEP certificate profiles on Android Enterprise dedicated devices aren't supported for app authentication.

     For Android (AOSP), the following limitations apply:

     1. Under Monitoring, certificate reporting isn't available for Device Owner SCEP certificate profiles.
     2. You can't use Intune to revoke certificates that were provisioned by SCEP certificate profiles for Device Owners. You can manage revocation through an external process or directly with the certification authority.
     3. SCEP certificate profiles are supported for Wi-Fi network configuration. VPN configuration profile support is not available. A future update may include support for VPN configuration profiles.
     4. The following 3 variables are not available for use on Android (AOSP) SCEP certificate profiles. Support for these variables will come in a future update.
        • onPremisesSamAccountName
        • OnPrem_Distinguished_Name
        • Department

     Note

     Device Owner is equivalent to Corporate Owned devices. The following are considered as Device Owner:

     (Video) S03E15 - Deploying SCEP certificates to Windows devices (I.T)

     • Android Enterprise - Fully Managed, Dedicated, and Corporate-Owned Work Profile
     • Android AOSP
       • User-affinity
       • User-less

4. Select Create.

5. In Basics, enter the following properties:

   • Name: Enter a descriptive name for the profile. Name your profiles so you can easily identify them later. For example, a good profile name is SCEP profile for entire company.
   • Description: Enter a description for the profile. This setting is optional, but recommended.

6. Select Next.

7. In Configuration settings, complete the following configurations:

   • Certificate type:

     (Applies to: Android, Android Enterprise, Android (AOSP), iOS/iPadOS, macOS, Windows 8.1, and Windows 10/11)

     Select a type depending on how you'll use the certificate profile:

     • User: User certificates can contain both user and device attributes in the subject and SAN of the certificate.

     • Device: Device certificates can only contain device attributes in the subject and SAN of the certificate.

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       Use Device for scenarios such as user-less devices, like kiosks, or for Windows devices. On Windows devices, the certificate is placed in the Local Computer certificate store.

     Note

     Storage of certificates provisioned by SCEP:

     • macOS - Certificates you provision with SCEP are always placed in the system keychain (System store) of the device.

     • Android - Devices have both a VPN and apps certificate store, and a WIFI certificate store. Intune always stores SCEP certificates in the VPN and apps store on a device. Use of the VPN and apps store makes the certificate available for use by any other app.

       However, when a SCEP certificate is also associated with a Wi-Fi profile, Intune also installs the certificate in the Wi-Fi store.

       When configured for VPN apps, user will be prompted to select the correct certificate. Silent certificate approval for Fully Managed (or BYOD scenarios) is not supported. If everything is setup correctly, the correct certificate should already be preselected in the dialog box.

   • Subject name format:

     Enter text to tell Intune how to automatically create the subject name in the certificate request. Options for the subject name format depend on the Certificate type you select, either User or Device.

     Tip

     If your subject name length exceeds 64 characters, you might need to disable name length enforcement on your internal Certification Authority. For more information, see Disable DN Length Enforcement

     Note

     There is a known issue for using SCEP to get certificates when the subject name in the resulting Certificate Signing Request (CSR) includes one of the following characters as an escaped character (proceeded by a backslash \):

     • +
     • ;
     • ,
     • =

     Note

     Beginning with Android 12, Android no longer supports use of the following hardware identifiers for personally-owned work profile devices:

     • Serial number
     • IMEI
     • MEID

     Intune certificate profiles for personally-owned work profile devices that rely on these variables in the subject name or SAN will fail to provision a certificate on devices that run Android 12 or later at the time the device enrolled with Intune. Devices that enrolled prior to upgrade to Android 12 can still receive certificates so long as Intune previously obtained the devices hardware identifiers.

     For more information about this and other changes introduced with Android 12, see the Android Day Zero Support for Microsoft Endpoint Manager blog post.

     • User certificate type

       Use the text box to enter a custom subject name format, including static text and variables. Two variable options are supported: Common Name (CN) and Email (E).

       Email (E) would usually be set with the {{EmailAddress}} variable. For example: E={{EmailAddress}}

       Common Name (CN) can be set to any of the following variables:

       • CN={{UserName}}: The user name of the user, such as janedoe.
       • CN={{UserPrincipalName}}: The user principal name of the user, such as janedoe@contoso.com.
       • CN={{AAD_Device_ID}}: An ID assigned when you register a device in Azure Active Directory (AD). This ID is typically used to authenticate with Azure AD.
       • CN={{DeviceId}}: An ID assigned when you enroll a device in Intune.

       Note

       (Video) Intune Tutorial 27 - How to Install NDES server for SCEP Certificate in Intune

       Avoid using {{DeviceId}} for subject name on Windows devices. In certain instances, certificate generated with this subject name causes sync with Intune to fail.

       • CN={{SERIALNUMBER}}: The unique serial number (SN) typically used by the manufacturer to identify a device.

       • CN={{IMEINumber}}: The International Mobile Equipment Identity (IMEI) unique number used to identify a mobile phone.

       • CN={{OnPrem_Distinguished_Name}}: A sequence of relative distinguished names separated by comma, such as CN=Jane Doe,OU=UserAccounts,DC=corp,DC=contoso,DC=com.

         To use the {{OnPrem_Distinguished_Name}} variable:

         • Be sure to sync the onpremisesdistinguishedname user attribute using Azure AD Connect to your Azure AD.
         • If the CN value contains a comma, the Subject name format must be in quotes. For example: CN="{{OnPrem_Distinguished_Name}}"

       • CN={{OnPremisesSamAccountName}}: Admins can sync the samAccountName attribute from Active Directory to Azure AD using Azure AD connect into an attribute called onPremisesSamAccountName. Intune can substitute that variable as part of a certificate issuance request in the subject of a certificate. The samAccountName attribute is the user sign-in name used to support clients and servers from a previous version of Windows (pre-Windows 2000). The user sign-in name format is: DomainName\testUser, or only testUser.

         To use the {{OnPremisesSamAccountName}} variable, be sure to sync the OnPremisesSamAccountName user attribute using Azure AD Connect to your Azure AD.

       All device variables listed in the following Device certificate type section can also be used in user certificate subject names.

       By using a combination of one or many of these variables and static text strings, you can create a custom subject name format, such as: CN={{UserName}},E={{EmailAddress}},OU=Mobile,O=Finance Group,L=Redmond,ST=Washington,C=US

       That example includes a subject name format that uses the CN and E variables, and strings for Organizational Unit, Organization, Location, State, and Country values. CertStrToName function describes this function, and its supported strings.

       User attributes are not supported for devices that don’t have user associations, such as devices that are enrolled as Android Enterprise dedicated. For example, a profile that uses CN={{UserPrincipalName}} in the subject or SAN won’t be able to get the user principal name when there is no user on the device.

     • Device certificate type

       Format options for the Subject name format include the following variables:

       • {{AAD_Device_ID}} or {{AzureADDeviceId}} - Either variable can be used to identify a device by its Azure AD ID.
       • {{DeviceId}} - The Intune device ID
       • {{Device_Serial}}
       • {{Device_IMEI}}
       • {{SerialNumber}}
       • {{IMEINumber}}
       • {{WiFiMacAddress}}
       • {{IMEI}}
       • {{DeviceName}}
       • {{FullyQualifiedDomainName}} (Only applicable for Windows and domain-joined devices)
       • {{MEID}}

       You can specify these variables and static text in the textbox. For example, the common name for a device named Device1 can be added as CN={{DeviceName}}Device1.

       Important

       • When you specify a variable, enclose the variable name in double curly brackets {{ }} as seen in the example, to avoid an error.
       • Device properties used in the subject or SAN of a device certificate, like IMEI, SerialNumber, and FullyQualifiedDomainName, are properties that could be spoofed by a person with access to the device.
       • A device must support all variables specified in a certificate profile for that profile to install on that device. For example, if {{IMEI}} is used in the subject name of a SCEP profile and is assigned to a device that doesn't have an IMEI number, the profile fails to install.

   • Subject alternative name:
     Select how Intune automatically creates the subject alternative name (SAN) in the certificate request. You can specify multiple subject alternative names. For each one, you may select from four SAN attributes and enter a text value for that attribute. The text value can contain variables and static text for the attribute.

     Select from the available SAN attributes:

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     • Email address
     • User principal name (UPN)
     • DNS
     • Uniform Resource Identifier (URI)

     Variables available for the SAN value depend on the Certificate type you selected; either User or Device.

     Note

     Beginning with Android 12, Android no longer supports use of the following hardware identifiers for personally-owned work profile devices:

     • Serial number
     • IMEI
     • MEID

     Intune certificate profiles for personally-owned work profile devices that rely on these variables in the subject name or SAN will fail to provision a certificate on devices that run Android 12 or later at the time the device enrolled with Intune. Devices that enrolled prior to upgrade to Android 12 can still receive certificates so long as Intune previously obtained the devices hardware identifiers.

     For more information about this and other changes introduced with Android 12, see the Android Day Zero Support for Microsoft Endpoint Manager blog post.

     • User certificate type

       With the User certificate type, you can use any of the user or device certificate variables described above in the Subject Name section.

       For example, user certificate types can include the user principal name (UPN) in the subject alternative name. If a client certificate is used to authenticate to a Network Policy Server, set the subject alternative name to the UPN.

     • Device certificate type

       With the Device certificate type, you can use any of the variables described in the Device certificate type section for Subject Name.

       To specify a value for an attribute, include the variable name with curly brackets, followed by the text for that variable. For example, a value for the DNS attribute can be added {{AzureADDeviceId}}.domain.com where .domain.com is the text. For a user named User1 an Email address might appear as {{FullyQualifiedDomainName}}User1@Contoso.com.

     By using a combination of one or many of these variables and static text strings, you can create a custom subject alternative name format, such as:

     • {{UserName}}-Home

       Important

       • When using a device certificate variable, enclose the variable name in double curly brackets {{ }}.
       • Don't use curly brackets { }, pipe symbols |, and semicolons ;, in the text that follows the variable.
       • Device properties used in the subject or SAN of a device certificate, like IMEI, SerialNumber, and FullyQualifiedDomainName, are properties that could be spoofed by a person with access to the device.
       • A device must support all variables specified in a certificate profile for that profile to install on that device. For example, if {{IMEI}} is used in the SAN of a SCEP profile and is assigned to a device that doesn't have an IMEI number, the profile fails to install.

   • Certificate validity period:

     You can enter a value that is lower than the validity period in the certificate template, but not higher. If you configured the certificate template to support a custom value that can be set from within the Intune console, use this setting to specify the amount of remaining time before the certificate expires.

     (Video) Intune Tutorial 29 - How to Create SCEP Certificate Profile in Intune

     Intune supports a validity period of up to 24 months.

     For example, if the certificate validity period in the certificate template is two years, you can enter a value of one year, but not a value of five years. The value must also be lower than the remaining validity period of the issuing CA's certificate.

     Plan to use a validity period of five days or greater. When the validity period is less than five days, there is a high likelihood of the certificate entering a near-expiry or expired state, which can cause the MDM agent on devices to reject the certificate before it’s installed.

   • Key storage provider (KSP):

     (Applies to: Windows 8.1, and Windows 10/11)

     Specify where the key to the certificate is stored. Choose from the following values:

     • Enroll to Trusted Platform Module (TPM) KSP if present, otherwise Software KSP
     • Enroll to Trusted Platform Module (TPM) KSP, otherwise fail
     • Enroll to Windows Hello for Business, otherwise fail (Windows 10 and later)
     • Enroll to Software KSP

   • Key usage:

     Select key usage options for the certificate:

     • Digital signature: Allow key exchange only when a digital signature helps protect the key.
     • Key encipherment: Allow key exchange only when the key is encrypted.

   • Key size (bits):

     Select the number of bits contained in the key:

     • Not configured
     • 1024
     • 2048
     • 4096 (supported with iOS/iPadOS 14 and later, and macOS 11 and later)

   • Hash algorithm:

     (Applies to Android, Android (AOSP), Android enterprise, Windows 8.1, and Windows 10/11)

     Select one of the available hash algorithm types to use with this certificate. Select the strongest level of security that the connecting devices support.

     NOTE: Android AOSP and Android Enterprise devices will select the strongest algorithm supported - SHA-1 will be ignored, and SHA-2 will be used instead.

   • Root Certificate:

     Select the trusted certificate profile you previously configured and assigned to applicable users and devices for this SCEP certificate profile. The trusted certificate profile is used to provision users and devices with the Trusted Root CA certificate. For information about the trusted certificate profile, see Export your trusted root CA certificate and Create trusted certificate profiles in Use certificates for authentication in Intune.

     Note

     If you have a multiple level PKI Infastructure, such as a Root Certification Authority and an Issuing Certification Authority, select the top level Trusted Root certificate profile that validates the Issuing Certification Authority.

   • Extended key usage:

     Add values for the certificate's intended purpose. In most cases, the certificate requires client authentication so that the user or device can authenticate to a server. You can add additional key usages as required.

   • Renewal threshold (%):

     Enter the percentage of the certificate lifetime that remains before the device requests renewal of the certificate. For example, if you enter 20, the renewal of the certificate will be attempted when the certificate is 80% expired. Renewal attempts continue until renewal is successful. Renewal generates a new certificate, which results in a new public/private key pair.

     Note

     Renewal behavior on iOS/iPadOS and macOS: Certificates can only be renewed during the renewal threshold phase. In addition, the device has to be unlocked while synching with Intune. If the renewal was not successful, the expired certificate will remain on the device and Intune does not trigger a renewal anymore. Also, Intune does not offer an option to redeploy expired certificates. Affected devices need to be excluded from the SCEP profile temporarily to remove the expired certificate and request a new one.

   • SCEP Server URLs:

     Enter one or more URLs for the NDES Servers that issue certificates via SCEP. For example, enter something like https://ndes.contoso.com/certsrv/mscep/mscep.dll.

     To allow devices on the internet to get certificates, you must specify the NDES URL external to your corporate network.The URL can be HTTP or HTTPS. However, to support the following devices, the SCEP Server URL must use HTTPS:

     • Android device administrator
     • Android Enterprise device owner
     • Android Enterprise corporate-owned work profile
     • Android Enterprise personally-owned work profile

     You can add additional SCEP URLs for load balancing as needed. Devices make three separate calls to the NDES server. The first is to get the servers capabilities, the next to get a public key, and then to submit a signing request. When you use multiple URLs its possible that load balancing might result in a different URL being used for subsequent calls to an NDES Server. If a different server is contacted for a subsequent call during the same request, the request will fail.

     The behavior for managing the NDES server URL is specific to each device platform:

     • Android: The device randomizes the list of URLs received in the SCEP policy, and then works through the list until an accessible NDES server is found. The device then continues to use that same URL and server through the entire process. If the device can’t access any of the NDES servers, the process fails.
     • iOS/iPadOS: Intune randomizes the URLs and provides a single URL to a device. If the device can’t access the NDES server, the SCEP request fails.
     • Windows: The list of NDES URLs is randomized and then passed to the Windows device, which then tries them in the order received, until one that's available is found. If the device can’t access any of the NDES servers, the process fails.

     If a device fails to reach the same NDES server successfully during any of the three calls to the NDES server, the SCEP request fails. For example, this might happen when a load-balancing solution provides a different URL for the second or third call to the NDES server, or provides a different actual NDES server based on a virtualized URL for NDES. After a failed request, a device tries the process again on its next policy cycle, starting with the randomized list of NDES URLs (or a single URL for iOS/iPadOS).

8. This step applies only to Android Enterprise devices profiles for Fully Managed, Dedicated, and Corporate-Owned work Profile.

   In Apps, configure Certificate access to manage how certificate access is granted to applications. Choose from:

   • Require user approval for apps (default) – Users must approve use of a certificate by all applications.
   • Grant silently for specific apps (require user approval for other apps) – With this option, select Add apps, and then select one or more apps that will silently use the certificate without user interaction.

9. Select Next.

10. In Assignments, select the user or groups that will receive your profile. For more information on assigning profiles, see Assign user and device profiles.

    (Video) S03E14 - Configuring NDES for SCEP Certificate Deployment (I.T)

    Select Next.

11. (Applies to Windows 10/11 only) In Applicability Rules, specify applicability rules to refine the assignment of this profile. You can choose to assign or not assign the profile based on the OS edition or version of a device.

    For more information, see Applicability rules in Create a device profile in Microsoft Intune.

12. In Review + create, review your settings. When you select Create, your changes are saved, and the profile is assigned. The policy is also shown in the profiles list.

Avoid certificate signing requests with escaped special characters

There's a known issue for SCEP and PKCS certificate requests that include a Subject Name (CN) with one or more of the following special characters as an escaped character. Subject names that include one of the special characters as an escaped character result in a CSR with an incorrect subject name. An incorrect subject name results in the Intune SCEP challenge validation failing and no certificate issued.

The special characters are:

• +
• ,
• ;
• =

When your subject name includes one of the special characters, use one of the following options to work around this limitation:

• Encapsulate the CN value that contains the special character with quotes.
• Remove the special character from the CN value.

For example, you have a Subject Name that appears as Test user (TestCompany, LLC). A CSR that includes a CN that has the comma between TestCompany and LLC presents a problem. The problem can be avoided by placing quotes around the entire CN, or by removing of the comma from between TestCompany and LLC:

• Add quotes: CN="Test User (TestCompany, LLC)",OU=UserAccounts,DC=corp,DC=contoso,DC=com
• Remove the comma: CN=Test User (TestCompany LLC),OU=UserAccounts,DC=corp,DC=contoso,DC=com

However, attempts to escape the comma by using a backslash character will fail with an error in the CRP logs:

• Escaped comma: CN=Test User (TestCompany\, LLC),OU=UserAccounts,DC=corp,DC=contoso,DC=com

The error is similar to the following error:

Subject Name in CSR CN="Test User (TESTCOMPANY\, LLC),OU=UserAccounts,DC=corp,DC=contoso,DC=com" and challenge CN=Test User (TESTCOMPANY\, LLC),OU=UserAccounts,DC=corp,DC=contoso,DC=com do not match Exception: System.ArgumentException: Subject Name in CSR and challenge do not match at Microsoft.ConfigurationManager.CertRegPoint.ChallengeValidation.ValidationPhase3(PKCSDecodedObject pkcsObj, CertEnrollChallenge challenge, String templateName, Int32 skipSANCheck)Exception: at Microsoft.ConfigurationManager.CertRegPoint.ChallengeValidation.ValidationPhase3(PKCSDecodedObject pkcsObj, CertEnrollChallenge challenge, String templateName, Int32 skipSANCheck) at Microsoft.ConfigurationManager.CertRegPoint.Controllers.CertificateController.VerifyRequest(VerifyChallengeParams value

Assign the certificate profile

Assign SCEP certificate profiles the same way you deploy device profiles for other purposes.

Consider the following before you continue:

• When you assign SCEP certificate profiles to groups, the Trusted Root CA certificate file (as specified in the trusted certificate profile) is installed on the device. The device uses the SCEP certificate profile to create a certificate request for that Trusted Root CA certificate.

• The SCEP certificate profile installs only on devices that run the platform you specified when you created the certificate profile.

• You can assign certificate profiles to user collections or to device collections.

• To publish a certificate to a device quickly after the device enrolls, assign the certificate profile to a user group rather than to a device group. If you assign to a device group, a full device registration is required before the device receives policies.

• If you use co-management for Intune and Configuration Manager, in Configuration Manager set the workload slider for Resource Access Policies to Intune or Pilot Intune. This setting allows Windows 10/11 clients to start the process of requesting the certificate.

Next steps

Assign profiles

Troubleshoot deployment of SCEP certificate profiles