Hi mic728107,
To better assist you with this concern, I would like to confirm if you're using OneNote for Windows 10 or the OneNote 2016 application. To know the difference between these two apps, you may check this
article.
If you're using OneNote 2016, kindly check if there are pending updates that need
to be installed for your application.
Also, if the notebook that won’t sync is stored on OneDrive, try opening the notebook in OneNote Online (www.onenote.com). This can help determine if the problem
is caused by the server or by OneNote.
- In OneNote, click File > Info.
- Right-click the URL shown below the name of the affected notebook, and click Copy.
- In your web browser, click inside the address box, and then press Ctrl + V to paste the copied URL.
- Press Enter to load the notebook in OneNote Online.
If you’re able to successfully open the notebook in OneNote Online and the changes appear, the problem may be caused by the desktop version of OneNote. Closing and re-opening the notebook there usually clears and successfully resets the connection. Follow
these steps:
- In OneNote, click File > Info.
- Next to the name of the affected notebook, click Settings, and then click
Close.
- Switch back to the notebook in OneNote Online in your browser, and then click
Open in OneNote on the ribbon.
Note: Depending on the notebook size and type of Internet connection you’re using, it may take a while to sync all the notebook content over to the desktop version of OneNote.
If you’re unable to open and view the notebook in OneNote Online, the source of the sync problem is likely with your server. If your notebook is stored on OneDrive, check this ***Service Status page***for any known interruptions or outages.
For more details and troubleshooting steps, you check this article
for reference.
Please respond to this thread to let me know how the issue progresses. Similarly, if you have more questions, please inform me by replying to this post.