I have a 2008R2 RDS server clone + Sysprep (SID is different from the original one). When I want to join it to AD Domain, I got a message telling that the join has failed, maybe because the server with the name "SERVER" was previously created with different credentials. The error was "Access denied".
The host name does not exist when I try to join the domain, it exists after I got the error, but the server does not join.
I got no error on the client server or the AD domain controller.