- sends you a notification about a meeting starting, with a join button. when you hover your mouse over the join button, the notification disappears. the meeting is nowhere to be found. you have to got to outlook calendar and join the meeting from there

- sometimes the same meeting ends up existing twice with the same name, with half the participants in here, the other half back there

- when your internet is bad, you can no longer hear the speaker talking, but the video feeds of 5 other participants all run fine

- when I join a call with a built-in microphone and a webcam microphone attached, teams pre-selects the webcam microphone, but sends the sound of no microphone at all. I have to go the hidden away settings, change to the built-in microphone and back to the webcam microphone to make it work.

- a few versions ago, teams would hammer microsoft servers with multiple authentication requests per second, eating a lot of CPU and bandwidth, but there's no indication of anything going on in the UI - you are still logged in and everything works normally.

- powerpoint presentations sometimes work, sometimes all you get to see is a black rectangle

- uploading files is extremely buggy, and it's not always clear if it did work or not.