If OneNote is not syncing maybe between devices, Teams, OneDrive, iPad, etc, then here are some practical working solutions to fix the issue.

OneNote sync failure error code: 0xE00009C8 typically occurs due to difficulties in syncing notebooks, preventing the data from being updated on all devices.

In such cases, you can fix the problem simply by closing the notebook on all your devices. 2] Force sync your notebooks One way to fix the syncing issues on OneNote notebooks is to force sync them.

On October 14, 2025, Microsoft is ending support for "OneNote for Windows 10," which was a UWP version of the note-taking app.