This message will be shown if your web browser is unable to access your camera/microphone as it already being used by another application. For example if you are using your camera in Zoom, Teams or Meet at the same time, you would need to close the other application and then try again.
If you receive this message and don't appear to have any other application also using your camera/microphone, we recommended rebooting your device to release any camera/microphone access and try again.