Please try to clear the cache data and reset MS Teams by the following steps:
1. Sign out MS Teams.
2. Delete the MS Teams cache folder by the following steps:
a. Open File Explorer Navigate.
b. Go to the “View” tab of File Explorer, check the box next to “Hidden Items”
c. Go to C:\Users\<your username on your PC>\AppData\Roaming\Microsoft\Teams
d. Remove all files in the following folders:
- Application Cache
3. Restart your PC.
4. Open and sign in MS Teams.
If the above steps can’t resolve the issue, please contact ITS Service Desk at firstname.lastname@example.org by sending the screen capture of the error message for further trouble-shooting.