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Thank you for that information. Since the notebook sections that won’t sync is stored on OneDrive, let us try opening the notebook in OneNote Online (at www.onenote.com). This can help determine if the problem is caused by the server or by OneNote. Here's how:
- 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.
Were you also able to check the links provided on the first message?
Please update us with the result.
Thank you.