I only have one USB headset and it just works on my laptop and desktop so I suspect it simply attaches to all input devices. I use the Noise Cancelling source

I only have one USB headset and it just works on my laptop and desktop so I suspect it simply attaches to all input devices. I use the Noise Cancelling source and it works. For a short while on Arch it crashed in use and the extra source vanished and went back to the default devices but an update fixed that within about a week. I think you should just use the Noise Cancelling source for everything and it will work. Teams has an echo test and you can always call a friend/colleague to test.