Microphone is not working or I can't hear myself or the interviewer

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REMEMBER that you can also record video answers with a mobile device (smartphone & tablet). No apps are required.
First, check that your speakers are turned on, and that your speaker volume is fairly high. Sometimes the microphone is just fine, but the speakers are turned off or muted. If you’re applying for a job, you can test the speakers easily by listening to video questions. If you’re an employer recording video questions, you can test the speakers by listening to music on your computer.

Check that you have allowed both camera and microphone from the address bar:

Chrome:

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Firefox:

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