How to Fix OneNote Sync Failure Error Code 0xE00009C8

Now, we are going to tell you how to fix the OneNote Sync failure error code 0xE00009C8; hence, stay tuned.

Failure in synchronizing notebooks simply means that the data cannot update across all devices. Here is how the OneNote sync failure shows up: error code 0xE00009C8. This message will appear because there is a connection problem or corrupted sync data that does not allow the OneNote app to connect to the cloud server.

The most common culprit here is corrupted local cache data, which stops the syncing process. Some possible causes include temporary authentication issues, an older version of the OneNote application, or a spotty internet connection. 

You will know how to troubleshoot the synchronization issues to make sure all your notebooks are updated across all your devices after this tutorial. Since we have discussed the root causes, let's look at how we can fix this issue.

1. Manual Notebook Sync

During data synchronization on all devices, the application has to reconnect to the cloud server afresh in case one does a manual sync on a laptop. With this, it refreshes data locally and in the cloud server. After that, it avoids conflicts and lets other devices download the latest data from the server. If the auto-sync isn't working effectively, this is the step to be executed.

Click File on the top right of Home.

From the drop-down menu after clicking View Sync Status, select Sync Now or Sync All.

Then, check if the problem has been fixed.

2. Check Server Issues

If you want to know whether Microsoft is to blame, check its server status. If Microsoft's services are down, it will block synchronization, and error messages may appear.

Check whether the OneDrive and OneNote servers are up and running by checking out the portal at portal.office.com/servicestatus.

Alternatively, you could check the Microsoft Community forums. If such is the case-that is, the reason for the inability to synchronize or to sign in-you need do nothing more to fix the error but wait until the servers are stabilized.

3. Sign Out and Back Into OneNote

Logging out and then logging back in will reset the authentication tokens and reconnect with the cloud service, such as OneDrive. In this way, if during the sync process the error message gets stuck or appears for whatever reason, that might deal with expired login tokens.

If your OneNote notes aren't syncing properly, try signing out and back in. This refreshes your login information, which should fix the problem.

To exit OneNote, go to your profile and click the "Sign Out" button.

Try to log in again after you have logged out using your credentials and observe if the problem is fixed now.

4. Clear OneNote Cache

The cache is utilized in saving temporary files to make the program highly efficient and reduce the loading time in some aspects. Unfortunately, these cache files sometimes get corrupted over time, which may lead to malfunctioning of an application.

You can get OneNote to sync again after having removed its temporary cache by having it build a new cache. So, to see if this resolves the issue you may want to clear the OneNote cache.

Please close the OneNote application before continuing.

Windows Key + R opens Run.

To navigate to it, in the OneNote cache, write the following path and press Enter: Path: C:UsersYourUsernameAppDataLocalMicrosoftOneNote16.0cache 

Change YourUsername with your actual username and the version of OneNote with the right number; in my case, that is 16.0.

Here, with Ctrl + A, select all files in it and use the Delete key. 

Restart the application to check if the problem has vanished.

If this issue persists, reinstalling OneNote will fix damaged files that may be the problem root.

If you got this far, we hope you have learned about How to Fix OneNote Sync Failure Error Code 0xE00009C8 and we hope we have been of great help.