Managing sound and video settings during Teams meetings and calls
a similar problem with Sennhieser Momentum 3 wireless earbuds - the solution for me on a Sony Xperia1iii phone is to edit the bluetooth settings and turn off "HD Audio:Qualcomm aptX Adaptive audio" and disconnect and reconnect to the earbuds.
Not good but it's a workaround...
Who is at fault here? Sennhieser, Sony or Microsoft? who knows.... I do know they will all blame each other :-(