Why are my OneNote tags not working or appearing properly?

Check if you are using the latest version of OneNote

OneNote applications evolve and certain features may not be available in older versions. Make sure you have the latest version of OneNote by upgrading or downloading the latest version of the app.
Check if any update or patch is available for OneNote

It is also possible that some patches or updates may need to be applied for the usual OneNote features to function properly.
Check if the problem persists in safe mode

If the problem occurs when trying to use a certain feature of the app, then it is advisable to launch OneNote in the safe mode and check if the issue persists.
Check the OneNote cache files

The cache files of OneNote can sometimes be corrupted due to hard disk errors. Hence, it is recommended to delete the OneNote cache files and launch the app again.
Contact the support team of OneNote

If none of the above solutions work, then contact the OneNote support team for further assistance.