How do I stop teams from turning my headset volume up to 100% in the "App volume and device preferences" before each call?

I've come across a bit of a work around

1. Open Settings > System > Sound
   1. Set the volume under output to what you want everything normal to be (eg 35%)
2. Scroll down to Advanced > Volume mixer
3. Adjust any teams values to 100%
4. Make a test call in teams and pay attention to the volume level under the system heading (not apps heading you just changed), if it scrolls on its own to a higher level (and your ears get blasted....) .. this is where the 'fun starts'
5. End the test call. Give it a good 5-10 seconds or the next test call does not seem to trigger the ringer/notification
6. Start a new test call and as the ring starts, click on the approx volume you want on the 'system ringer' (eg 40%)
7. end the test call and go back to step 5 until you get it right. You seem to get about half a second to adjust the volume for the notification/ringer

This also seems to set the in call default volume (and seems a touch quite to me), but you can still use the speaker icon to increase the volume while on the call.

After this, I still have the issue that other sounds loose fidelity, but at least my ear drums don't get blasted!

Hope it helps someone

I think the incompetent ones are behind the issue we all are trying to fix

I have the same issue too, using Jabra2 evolve 85.

Hey folks, I ended up finding a good solution: my work let me switch to a Macbook Pro.

Teams doesn't have this issue for macOS. Though it does still do some weird stuff.

This happens to me, I am using a wired Jabra headset. Very annoying behaviour.