Our vShpere server had three local identity sources.
* Active Directory (please set correct credentials)
* system-domain (this one was newley created by the installtion)
* local users of the vCenter server
The problem was the local one of the vCenter server. After deleting this one all went fine. This one onlay appears if the vCenter server is a domain member ( I was told by vmware support).
Have luck !
Regards Wolfgang