Follow these steps:
- Have you clicked the Add to stage button on your guest? In order to be seen and heard, a guest needs to be added to the stream
- Have your guest go to Settings -> Audio. When they speak out loud, do the grey dots flash green in response to their voice? If not, their mic may not be working. Do they have the correct mic device selected in that same menu?
- If you're on a computer, it may be possible your speakers are not working. Try going to Settings -> Audio and clicking the Test button. If you don't hear music playing, try switching to a different speaker.
- If you're on an iPhone or iPad, you may be experiencing a rare Safari bug. Try tapping on the video of the person your can't hear. A menu should appear that helps you fix the issue.