This article collects various notes for troubleshooting issues with Google Meet sessions.
Also see: Google Meet cheat-sheet
Audio and Video Settings
If you're having video or audio issues in Google Meet, try changing your settings.
Here is Google's help article - https://support.google.com/meet/answer/9302964
Step by Step Guide
1. Browse to https://meet.google.com
2. Select the gear icon in the top left hand corner (prior to joining a Meet session).
If already in a meeting select the three dot icon from the bottom menu bar and then Settings.
3. Make sure both microphone and speakers are to use the internal defaults. If there's an external device connected you may also see that as an option.
Select Video and check the webcam is working.