Teams treats the incoming call ringtone as media to be controlled, breaking media key functionality.
When using the media keys on my keyboard, Teams treats the incoming call ringtone as media to be controlled. This means that if I hit the play/pause button for the song/video I'm currently playing in another app, Teams toggles the ring tone and continues ringing until I hit the play/pause button again.
Windows 10 Pro: 10.0.19041 Build 19041
Teams: 1.3.00.28779 (64-bit)
Bouke Haarsma commented
Looks similar to my issue on macOS: https://microsoftteams.uservoice.com/forums/908686-bug-reports/suggestions/42037405-pressing-play-pause-on-keyboard-play-pauses-teams
Same with Windows 10 Enterprise, 1909