My org does not use Teams at all. But I get invited to external Teams meetings sometimes.

As a result, Teams is on my computer, adds itself to the startup items, then opens up to a login window every time I turn on my computer. The X button does not work to close the window. I have to open Task Manager and kill it every time. I can disable it in startup items, but it puts itself back there, next time I join a Teams meeting.

Also, if I am using my computer in the closed position, it still chooses the integrated webcam and microphone every time, even sometimes switching to them randomly during a meeting.

Of course, I am running on an unusual setup that I'm sure Microsoft didn't think to test: I am running Microsoft Teams on Microsoft Windows 10 on a Microsoft Surface Pro computer.

You can use Teams from your browser, no need to install it.

I will try that next time. I don't think that occurred to me because the Zoom app experience is very good. What I have been doing instead is joining from the Teams app on my phone unless I must share content.