Any ideas???

Hi there, i still have this problem after a month.

Any help appreciated...

PS it is ONLY happening for a SINGLE domain, not a server wide problem. I just can figure out where the problem might be. I think may related to that error, but i am stuck

SolidCP.Providers.HostedSolution.Exchange2016.FixShowInAddressBook(Runspace runSpace, String accountName, String[] addressLists, Boolean HideFromAddressList)

Have you renamed GAL?

Check name of GAL in SQL database and compare with existent.