If OneNote is not recognizing your handwriting or text input on a Mac, review the following steps:

1. Make sure your version of OneNote is up to date.
2. Check the settings on your Mac to make sure that the microphone and camera are enabled.
3. Check the version of macOS you have; OneNote is only compatible with recent versions of macOS .
4. Check if the handwriting version of OneNote is the same as other users on the same Mac. You may need to update OneNote if the version is different.
5. Make sure that your Mac's language setting is set to English (United States).
6. Check your Mac's Bluetooth settings to make sure it's connected. Try turning on the AirPrint mode on your Mac as well.
7. Close all open applications and restart your Mac. This will help OneNote run more efficiently.
8. If nothing has helped yet, uninstall and reinstall OneNote for Mac from the App Store.