When trying to publish the FAS certificate templates on CAs, there is an error:

This is because the default windows configured certificate agents are not used and instead the Sectigo certificate request agent handles the request.
You will find the Sectigo certificate request agent/plugin to be installed on the FAS server.
This is by design behavior and can also be verified with the help of the following PowerShell script that simulates the behavior of publishing the FAS templates to CA.
# Your CA's address here$address="youdomain\Your-CA-Name"
# CLSID of the Microsoft COM class CertificateAuthority.Request.1$guid="98AFF3F0-5524-11D0-8812-00A0C903B83C"
# Create a CertificateAuthority.Request.1 object with interface ICertAdmin2$comObject = [Activator]::CreateInstance([type]::GetTypeFromCLSID($guid))
# Get the list of templates; 29 is CR_PROP_TEMPLATE, 4 is PROPTYPE_STRING$comObject.GetCAProperty($address, 29, 0, 4, 0)
If the FAS templates are published, the output would look like this:
Citrix_SmartcardLogon1.3.6.1.4.1.311.21.8.15364189.13363262.6966947.3046217.7536512.134.14235111.8070130Citrix_RegistrationAuthority1.3.6.1.4.1.311.21.8.15364189.13363262.6966947.3046217.7536512.134.5751883.7434557Citrix_RegistrationAuthority_ManualAuthorization1.3.6.1.4.1.311.21.8.15364189.13363262.6966947.3046217.7536512.134.7242031.15108994
Contact Sectigo or your internal PKI infrastructure team to review certificate template publishing requirements and also user certificate requirements.
You can manually publish FAS templates in CA.
When trying to publish the FAS certificate templates on CAs, there is an error:
