First off… I really don’t like OneNote/SharePoint sync issues. OneNote has its own funky caching of credentials so that it can keep things sync’d in near-real time. The problem is that you sometimes end up with one or more notebooks that won’t sync with their SharePoint versions regardless of the SharePoint permissions. Those errors are nasty…
My SharePoint Buddy did find a way to fix some of the errors, however. It made sense once she pointed it out, and it fixed two pending issues I had with various users. So in order to remember it myself and share it with others, here it is.
In OneNote, you have this particular view. Click on the File tab:
Click on View Sync Status:
Click Sync Now on the notebook that’s having issues:
That should prompt for your Windows user name and password:
OneNote will cache those credentials, and your synching should now work properly.