Both servers are:
- The same version OS and kernel
- both are using the same DC
- both are in the same domain
- there are no AD bridging integrations
- adquery group database_administrators -A results in the members, etc being printed on the system where it works. On the other system, it says no such group.
And yes, I would agree they are not configured equally, but... one server was installed in the morning, one in the afternoon. The same package and steps were used for both... no idea where the difference might have happened.