Why Do My Webcam And Microphone Not Work? — from techlearning.com by Luke Edwards
Webcam and microphone not work? This is how you can get up and running.

Excerpt:

Webcam and microphone not work? That can be a frustrating situation to be in, especially when you need to teach a class over Zoom or attend a school meeting using Meet. Whatever your video chat platform, without a microphone or webcam working, you’re stuck.

Thankfully, it can often be the case that it’s not a hardware fault with your device but rather a setting issue, which can be relatively easily fixed. So even if you’re in a chat right this minute, frantically scouring the web for a fix and finding yourself here, you may yet join that meeting.

This guide aims to clarify a few areas that should be checked before going into panic mode and heading to your hardware store with the credit card at the ready.