@Kevin Arc , Agree with Nick, beginning on July 29, 2021, the Certificate Connector for Microsoft Intune replaces the old connector.
For the new certificate Connector for Microsoft Intune, only the Server authentication certificate is used. We can follow the steps in the articles below to configure SCEP to see if it can work well:
Configure infrastructure to support SCEP with Intune
https://learn.microsoft.com/en-us/mem/intune/protect/certificates-scep-configure
Certificate Connector for Microsoft Intune
https://learn.microsoft.com/en-us/mem/intune/protect/certificate-connector-overview
Prerequisites for the Certificate Connector for Microsoft Intune
https://learn.microsoft.com/en-us/mem/intune/protect/certificate-connector-prerequisites
Install the Certificate Connector for Microsoft Intune
https://learn.microsoft.com/en-us/mem/intune/protect/certificate-connector-install
Hope it can help.
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