Internal Microphone/speaker
Need help with the internal speakers on my MAC, I am unable to use ZOOM, Google Meeting or FaceTime as I can hear the person calling or running the meeting, but they cannot hear me. Help!
iMac 21.5″ 4K, macOS 11.6
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Check System Preferences > Sound and make sure that the internal mic is selected at the input device.
Also check that the sound level slider is set appropriately.
Also check that your mic is not muted... see the mute key on the keyboard (F10)
Reboot your Mac and see if the problem is cleared. If rebooting your Mac doesn’t fix things, see if the problem still happens in Safe mode (hold the shift key down at startup). It can take much longer to safe boot (10 min) so be patient.
How to use safe mode on your Mac - Apple Support
Safe mode forces the OS to clear certain caches and logs and do other miscellaneous housekeeping. It's non-destructive to user data so is safe to do. Very often certain weird software behavior is corrected by simply logging in this way as a troubleshooting method. When you're in safe boot, the machine will not be at its best performance, especially with graphics, but that's expected.
Does the problem persist while in Safe mode?
Exit safe mode by restarting your Mac normally and re-evaluate the issue again.
If the problem is still unresolved, please return here and post a reply and we’ll see what else we can come up with for help.