This team block is so agressive to firefox users that it's literaly hardcoded as if web browser firefox then deny.
You cam override that by changing a parameter in firefox to advertise itself as another we browser. I don't remeber how i did it but, once i had to use firefox and i just changed that stting in order to advertise me to the host as a edge browser. With that changed i could use teams as normal.
Epic drm.
Only Trump did I think.
The war dates before that. Since 2014 Russia had snipers in dombas.
Reference: https://www.youtube.com/watch?v=u-qO42qjShg