Hello @154043 ...
By chance, are you using Google Chrome for your web browser? If so, on the address bar of the browser, on the far right side of the screen, there is a star icon. When you are trying to use your camera, do you see an icon to the left of the star that looks like a video camera? If so, try clicking on that icon to see if you can change the source of the camera/microphone. That may help to resolve this issue.
Please let us know if you have any other questions about this. Thanks! Stay safe, and be well.
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