On an HP Zbook studio G5 running Mint 19.1
Plantronics C3320 headset plugged into a USB port (on the laptop, not on the G3 docking station)
The teams_1.2.00.32451_amd64.deb package installs fine, and the test call works as expected.
However when calling a coworker, all he hears is very bad static that gets louder when I speak.
Same problem when input is set to the builtin microphone.
In sound preference:
Device set to Plantronic Blackwire 3220 Series Digital Stereo Duplex (IEC958)
Input connector set to "Digital Input (S/PDIF)
In the Teams Settings->Devices, speaker and microphone are set to Plantronic Blackwire 3220 Series Digital Stereo Duplex (IEC958)