How is the Teams app managing to screw up audio so badly?

[Makosuke]

This is less a plea for help (I'm assuming it's not user-fixable), and more of a "how did Microsoft even manage to do this?"

Any other app I'm aware of, audio on iOS 26 is pretty straightforward: By default the sound comes out of the speakers. If I hit the volume up/down buttons, the sound gets louder or quieter, and the sound adjustment bar moves. If I put in my AirPods, the sound starts playing through them. If I connect to my car, audio starts playing through the Bluetooth system.

Occasionally an app will offer the choice of sound output (based on what I'm connected to, and maybe a "phone" option that plays through just the ear speaker at much lower volume), but otherwise it makes sense and is handled at the OS level.

Except Teams: It seems to vary a bit depending on what was connected when it was launched, but I'm sitting here in a meeting with the audio completely "stuck", and this is pretty much par for the course.

• Volume up/down buttons: The little OS-level animation of them being pressed reacts, but sound volume doesn't change at all.
• Swipe down and adjust the volume from the slider: slider reacts and shows a phone icon, but volume doesn't change at all.
• Connect AirPods: Sounds keep playing through phone speakers. Same with other Bluetooth speakers.
• Use Teams audio control to select "phone" instead of "speaker": No change, still on speaker.

Generally speaking, if I leave a meeting, close Teams, and re-launch it, I might be able get it to play through whatever connected device is actively playing sound at that moment, but even that is hit-and-miss.

Basically, I'm curious how an app can completely override all audio output control on the phone, including the hardware volume buttons. Why Microsoft would break things that badly is a question I consider answered after decades of using dealing with their software, I'm just curious how this capability exists in iOS without other apps horribly abusing it.