Messenger, Teams. People can't hear my voice. Have checked all the microphone settings and done system checks.

[David Stuart1]

This is the in-built microphone on an Acer Swift 3. When using Facebook messenger and also Teams I can hear the other person but they cannot hear me. The microphone starts a feedback loop with the speakers on the laptop. I have checked all the microphone settings. The only fault I see is when I test the microphone volume it is very low to non-existent. The sound recorder app. does not pick up anything. I'm moving towards a hardware fault for lack of. any other solution.

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