Managing sound and video settings during Teams meetings and calls for optimal communication
a workaround is that after you raise the mic boom arm, click on the lower volume button on the headset (while the Arm still up) the audio will come back live.
is not perfect, was not how it was working until early December, but at least is a work around to still have wireless headset (via PC Bluetooth) without the Jabra's dongle plugged on a port,,
Quick update. Today, Dell recommended an update for my PC. it installed something called DELL PAIR. after that simple installation finished, the headset works perfectly. rising the Mic's arm or pushing the mute button on Jabra headset only mute the Microphone, and not the audio.
This definitively confirms - in my opinion - this is a software / driver issue