Additional features, settings, or issues not covered by specific Microsoft Teams categories
ChrisDDay,
As others have pointed out, quitting the Plantronics Hub software (not just X'ing out of it, actually right clicking its icon in the taskbar and selecting Quit Plantronics Hub) resolves the issue for now. I confirmed it now since I have been experiencing the issue this morning and was able to test now since I'm on a work Teams call. This resolved the issue with muting in Teams. However, I wonder if it will cause issues with my Avaya One-X application.