Why are my inserted audio recordings not playing in OneNote on a Mac?

Check the audio settings:

Make sure the microphone is not manually muted, the microphone boost is checked, and the recording device is set correctly
Update audio drivers:

Get the latest version from the audio manufacturer’s website, install, and try again
Troubleshoot the audio device:

Go to the Audio control panel in System Preferences and try the various diagnostic tests to isolate the issue
Check compatibility:

Make sure the version of OneNote and the device are compatible. If they are not, getting an updated version might help
Uninstall and reinstall OneNote:

Sometimes this can fix the issue by ensuring the application is configured properly and up to date