Additional team and channel-related features and issues within Microsoft Teams for Education
I am having the same issue. Thought it was my computer since its from the school. I have used wireless headphones with a built in mic and the other people in the meeting were able to hear me. The next issue after this is when I share my screen and have my head phones plugged in I am unable to share my computers sound with my participants. So that is my next thing to try to fix. Hopefully this issue gets resolved quickly.