Click on the padlock icon in the browser address bar (in the top left corner next to URL)
Click on Allow for Camera, Microphone, and Sound
If this does not solve it, then probably your system is blocking permissions. Go here to solve it.
Audio and video troubleshooting
Click on the padlock icon in the browser address bar (in the top left corner next to URL)
Click on Allow for Camera, Microphone, and Sound
If this does not solve it, then probably your system is blocking permissions. Go here to solve it.