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.
When I'd search "(location) weather" on Google (e: in Chrome) and I'd get a really nice at a glance forecast right on top. Do the same thing in Firefox and I'd get a whole bunch of weather websites I could go to. The former obviously being a better, more direct experience. I found an extension that fools Google into thinking it's Chrome and all works fine with that.
I'm amazed if this doesn't violate some antitrust regulation
Started using https://qwant.com a few years ago and the bliss of forgetting about amp links is real.
(though I am considering https://kagi.com instead.)