@NS2004 just a wild guess, do any of the certificates involved have a longer lifetime than 12 months (CA excluded)?
Apple does a strict enforcment of the CA/B Forum rules and causing issues if Client/Server-Certs are valid for more than 390 days.
Considering you're able to login with Credentials+MFA it shouldn't be a general Problem which some macOS Users reported prior to the latest 12.1 update.
Answers
@NS2004 just a wild guess, do any of the certificates involved have a longer lifetime than 12 months (CA excluded)?
Apple does a strict enforcment of the CA/B Forum rules and causing issues if Client/Server-Certs are valid for more than 390 days.
Considering you're able to login with Credentials+MFA it shouldn't be a general Problem which some macOS Users reported prior to the latest 12.1 update.
--Michael@BWC