Troubleshooting: OneNote Mobile
On this page I'll offer some tips for troubleshooting the mobile apps. One of the first things to do if you're having issues with any of the OneNote Mobile apps is to check and make sure you have the latest version of the Mobile app for your device.
OneNote for Android: "An unknown error occured and the action couldn't be completed."
If you find yourself getting the error message above try going to OneDrive and rename your Documents folder to something else, like Documents 2. Then try opening OneNote Mobile on your device and see if sync capability is restored.
I'm Getting an 0xE0000B5E error when I sync my Notebooks!
Do you have any sections with really long file names - and/or filenames that include special characters like symbols or underscores? If so, try taking out the symbols and see if the problem goes away - often those symbols (or especially long section names) can cause problems with sync.