If people in a meeting can't hear you, you might be muted or you might not have configured your mic correctly.
To change your speaker, microphone, or camera settings when you’re on a call or in a meeting, select More options > Show device settings in your meeting controls. Then, select the speaker, microphone, and camera options you want.
Troubleshoot microphone issues on a Mac
If you're using a Mac and you're having trouble getting your microphone to work, you might need to change one of your privacy settings.
Here's how to check:
Open System Preferences
Select Security & Privacy
Under Privacy, choose Microphone on the left
Make sure Microsoft Teams is selected