Here are a few things to consider when troubleshooting an issue with OneNote:

1. Check that OneNote is the latest version.
2. Try a reboot of your device. This will typically resolve most issues.
3. Check OneNote’s privacy settings and ensure they are set correctly.
4. Remove any recent installed updates that could be causing interference.
5. Check that OneNote is set to launch automatically when you start up your device.
6. If all else fails, uninstall and reinstall the application.