Comment # 27 on bug 1182552 from Takashi Iwai

Hrm, then I'm not sure what went wrong.

Just to make things straight: before you start Teams, open pavucontrol, and see
that Plantronics headset recording works (in "Input Devices", VU meter moves
with the voice).  Then start Teams, check the test call or such.  At this
stage, it still works?

We need to identify the problem happening in which situation.  The symptom
("just stop working") is way too ambiguous, unfortunately...

And the next step would be to get the more verbose log from pulseaudio.
Stop pulseaudio once, and restart with verbose debug options:

% systemctl --user stop pulseaudio.socket
% systemctl --user stop pulseaudio.service
% pulseaudio -vvv > pa.log 2>&1

And get the point where the problem happens.