Use phone / companion device as webcam
Via the companion device feature, I have been using my phone as a webcam. I do this by joining a teams call on my desktop with audio but no video, then joining the same call using my device with video but no audio and speaker switched off. This works well but it is annoying to set up.
It would be much more convenient if you could set up your phone as a webcam before joining the call, so that once you join on your desktop it would automatically join on your device with video on and audio/speaker off (or whatever other settings you want). It seems to me this would be relatively easy to do given the existing functionality.
Rob V commented
I've seen videos where the person connects with the phone and it prompts them to join in "companion mode" if they are connected via desktop too. I'm connected on a Mac and when I open my phone's Teams app it says "how would you like to connect to this device." I get all the audio/video setting choices to OP referenced in the post, but never get the words "companion mode" on the screen. Is that old terminology or is my phone connecting differently than "companion mode?"
I agreed, but I would also recommend to use audio as well. In my experience the phone has better microphone&audio than notebooks.
But it is annoying than you can't use companion mode in all situations! It works fine with meeting but if you start a call on a phone or tablet, you can't join later with your notebook to show something on your screen...