• logged out user. Log in with itadmin and cleared the Teams cache.

• C:\Users\username\AppData\Roaming\Microsoft
• **Delete the Teams folder in the Microsoft folder**
• user logged back in, started vpn and Teams worked.

Research the issue with log files

If you right click the icon, there's a "get log file" setting which opens a log .txt file at C:\Users\EID\AppData\Roaming\Microsoft\Teams