Since I have a PC and server 2022 domain controller in the garage (here:) I installed it on the server. (Incidentally, the Domain name is SOPRANO

I get the same error on Junior here, and A.J. in the kitchen.
I then get this error: Connection to service manager on \\either failed 5.
A.J. is a member of the domain, Junior is not.
Also, both have a question mark under network neighborhood. I'm assuming that's because the clients are not installed.