Error: Operation failed because of a bad request

Billy_Graham - The Microsoft Teams bad request error is an error that mostly happens to the web version of the app. If you are trying to access the web client of Microsoft Teams, try changing the web browser to fix the error. At times, the bad cache can create issues with the browser functionality.
If it works without any problem on the desktop app, it is possible that this is a momentary fluke and may resolve itself if left alone.