You are my hero! I've been dealing with this issue for months now. My microphone worked in every application but Zoom. I couldn't complete a sentence without it fading out my voice to those listening. I have a new Dell Latitude 5300 laptop. I'll repeat your instructions for those who may want to try this fix:
- Open Sound Settings>Input>Device Properties>Additional Device Properties>Advanced tab
- Uncheck “Allow applications to take exclusive control of this device”
- Uncheck “Enable audio enhancements”
- Apply