Another reliable fix to address the internal microphone not working on Mac is to reset NVRAM/PRAM. To enter the app’s preferences, open the app and press Command key +, (comma key). If your display has an internal microphone, it’s listed as Mac model. If your video or audio is not working, you may need to change your. All sound input devices available to your Mac are listed. You must enable access to your camera and microphone in order to use these features. (You may need to scroll down.) Click Input on the right, then select the device you want to use in the list of sound input devices.

In case the app’s open, you’ll need to quit it to enable microphone access. Check the box next to an app to allow it to use your microphone. In the Privacy tab, choose Microphone from the list on the left. From here, you need to navigate to Security & Privacy. Most likely, the mic settings would be in the app’s preferences. On your Mac, choose Apple menu > System Settings, then click Sound in the sidebar. To enable the microphone on Mac, go to System Preferences. Sorry if this doesn't work but maybe try pressing command + space (basically open spotlight search) and look up 'audio midi setup' and after opening that you'll want to go through all your audio devices and make sure your microphone volume is up, 'ZoomAudioDevice' is up for the input section, etc, and here I am mostly, just to mention, looking for audio inputs like 'Built-in Microphone' and stuff like that, make sure all your input volumes are set to 0. Make sure everything is working correctly there.

Mac air microphone not working