I have the same issue. Sync task populates groups with clients like client01.contoso.com. After I install agent there, new item client01 (without domain name) is created next to client01.contoso.com, which is still marked as "unmanaged". Switching "Computer Creation Collision Handling" doesn't seem to affect anything. I still have a managed client01 computer and an unmanaged client01.contoso.com in my console. What I need: 1. Remove duplicated items. At very least, stop them from reappearing after sync 2. Make console show FQDN for managed computers instead of machine name only