Fixing a non-functioning microphone should be easy.
In order to solve the problem of a non-functioning microphone, try the following:
- Click on "Device Settings" and check that your mic is selected.
- Reload the page.
Side note: Occasionally, bluetooth headphones can confuse your browser and camera. This will result in you being able to see everybody else in your group but not hear them. They will not be able to see or hear your video. To fix this, try disconnecting and reconnecting your headphones.