Teams Outlook Addin Missing

 Hello

Please i need your help on this issue. Teams Outlook Addin Missing.

The diagnostics confirmed that the Teams add-in and Classic Teams are missing:

I followed the troubleshooting instructions, and the add-in is still not enabled. Whilst the checkbox can be ticked, it cannot be enabled. I have also tried to add the add-in .dll file from the below window (following the filepath), but receive an error. 

This is the Teams version: