Step 1: Launch the Zoom app and click on the settings icon.
Step 2: Go to the Audio tab. Click on Advanced present at the bottom of the Audio tab.
Step 3: Click on the drop-down boxes available next to each option. Change from Auto to Moderate or disable it for each option one by one. See if the microphone works
Alternatively, check the box next to the ‘Show in-meeting option to Enable Original Sound from microphone’ option.