Devices have permission but there is still no sound
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This usually happens when headphones, a monitor, or a projector was connected earlier and your computer is still routing audio to it — most common on Windows.
Wrong microphone: Click the settings icon to the right of the mic and camera buttons. Switch to a mic that's actually connected (accept any new permission prompt).
Windows output: right-click the speaker icon in the taskbar › Sound settings, and pick the correct playback and input devices. Restart your browser if needed.
Mac output: System Settings › Sound › Output, and select the device you want.