I have SCSM installed on one domain, and that pulls groups with users from another domain. Connectors "work", but the portal info and AD info and not completely synced. In the portal, it shows an old manager, but in AD it has the new manager.
Domain where users\groups reside Universal security group
Domain where portal resides Domain Local security group
I have run the truncate sql commands and when sync happens, it brings the user account back into SCSM, but the data is not complete