Directory Synch (MIIS) and consistency check error

Hey everyone, looking for some help with an issue with Directory Synch using MIIS. Was working without issue and is now giving an conistency check error when the client tries to connect to the database. ID being used can open the client and the database directly without issue, but when trying through automation, it fails with the consistency check error. Tried on a blank database on the same server, same error. Tried on a blank database, different server, worked. Ideally we want to keep it where it is, but cannot figure out why it is doing this. Nothing has changed on the server that I can see and both servers are running same versions etc…Any ideas?

Thanks in advance !

Lisa