Teams users using teams.microsoft.com (primarily Business and Enterprise customers on a paid plan, but also some free/personal legacy accounts) should be able to use Teams without issues now.

However, there is a second Microsoft Teams instance running on teams.live.com. Most Personal/Consumer/Free users of Teams are on that version, and there, Teams is currently showing a "browser unsupported" banner.

https://github.com/webcompat/web-bugs/issues/25070#issuecomm...