Hello Mohammad Samee Ahmed, Thank you for posting in our Q&A forum.
First, check if you can enroll this computer certificate manually via MMC with local administrator or domain administrator logged in.
If so, maybe this similar thread below can explain the question.
https://social.technet.microsoft.com/Forums/en-US/ca54e0a7-d530-4851-b529-0a079e492091/quotthe-certificate-types-are-not-availablequot-windows-10-windows-2016-ca-server
Hope the information above is helpful.
If you have any question or concern, please feel free to let us know.
Best Regards,
Daisy Zhou
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