Windows Server 2019 domain controllers must have a PKI server certificate. GROUP ID:V-205645 RULE ID:SV-205645r958448 Domain controllers are part of the chain of trust for PKI authentications. Without the appropriate certificate, the authenticity of the domain controller cannot be verified. Domain controllers must have a server certificate to establish authenticity as part of PKI authentications in the domain.
Solution
Obtain a server certificate for the domain controller.