Hello,
It looks like that you are using a self-signed Root CA certificate.
If so, you need to import it into the trusted root ca container on the local computer.
Since this is a forum mainly covering questions about MATA, I would recommend to submit a new question on the following forum for better support.
https://social.technet.microsoft.com/Forums/en-US/home?forum=winservergen&filter=alltypes&sort=lastpostdesc
Best regards,
Andy Liu
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