after a UPN change (only surname) in an Azure AD Hybrid Enviroment, the user activation of "Microsoft 365 Apps for business" fails.
After the user signs in (new User Profile) to an on-premise computer and opens Word or Excel, the app is in read-only mode, but the display account name is the new.
Log out and new in doesn`t help.
The change was few days ago.
Separate installations of teams and one-drive, on the other hand, do not cause any problems...
does anyone have a tip?