I have a 2018 MacBook Pro running Mojave. Midway through a Zoom meeting, people were suddenly not able to hear me. I checked System Preferences and saw that my internal microphone was selected as the input, but it wasn't picking up my voice (though it picked up the sounds of me typing or tapping). After turning my input volume to max and disabling ambient noise reduction, I was still only barely audible.
I have tried resetting my PRAM and SMC, but to no avail. Any help would be greatly appreciated.