disconnected in a teams call after 10 sec

Hello

When I join a Teams meeting, I am disconnected after 10 seconds. I tried  the test call in parameters, it is the same.

If I use the Web-based Teams, no problem.

Teams version : 1.4.00.7174 (64 bits)

OS : Windows 10 Pro 20H2 19042.870

This behaviour is recent, I have been using Teams for months on this computer. It began after a reboot for Windows automatic updates

I removed the content of the folder %Appdata%\Microsoft\Teams and reboot but no change.

Any idea 😉 ?

Thanks for your help 

fredo