@Anonymous , From your description, I know the SCEP certificate profiles was failed to be deployed with error. From the error message, it only says "An internal server error has occurrred". A general error.
To troubleshoot such case, log analysis is necessary. With Q&A limitation, it is not a better channel for log analysis. We suggest to open a case to work on this.
https://learn.microsoft.com/en-us/mem/intune/fundamentals/get-support
In addition, share an article for troubleshooting SCEP certificate profiles with Microsoft Intune:
https://learn.microsoft.com/en-us/mem/intune/protect/troubleshoot-scep-certificate-profiles
Thanks and have a nice day.
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