I can see my OneNote Notebook in OneDrive, but I am not able to open it

Blair 0 Reputation points
2026-09-30T13:37:26.5166667+00:00

I am on a Mac and recently completed a MacOS update. When attempting to access my OneNote notebook after the update was completed, I am getting 404/file not found error messages, and after hours of attempted troubleshooting, I am still not able to access the notebook. The notebook is visible in "my files" but I cannot open it.

Link to notebook: [PII removed]

Screenshot of error message attached.

Screenshot of OneDrive attached. The Notebook at the bottom, "My Notebook" is there, but is not labeled with "My files" like the other ones are.

I last accessed this Notebook yesterday, before my Mac updated. It was working fine, and accessible until that point. Please help.

Microsoft 365 and Office | OneNote | Other | MacOS
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  1. AI answer

    2026-09-30T13:37:44+00:00
    1. First, test whether the notebook opens in OneNote for the web. In OneNote for Mac, select Notebooks > Notebooks > Copy Link to Notebook, paste that link into a browser, and press Enter.
    2. If the notebook opens in OneNote for the web, the issue is likely the Mac app connection. In OneNote for Mac:
      • Select Notebooks > Notebooks > Close This Notebook
      • In the browser, with the notebook open in OneNote for the web, select Open in OneNote
      • Wait for the notebook to resync fully
    3. If the notebook does not open in OneNote for the web and shows 404/file not found there too, the problem is likely with the notebook location on the service rather than the Mac app.
      • Since the notebook is visible in OneDrive, sign in to OneDrive and browse your folders directly, especially Documents or Notebooks, and try opening the notebook from there.
      • On macOS 12.1 and later, OneDrive’s local path changed to Library > Cloud Storage > OneDrive. If recent or pinned locations are being used after the macOS update, open Finder and browse to Library > Cloud Storage > OneDrive or use the OneDrive alias in the old location.
    4. If the notebook is shared, open it from the shared notebook link in the browser, then in OneNote for Mac select File > Open Notebook and choose the shared notebook.
    5. If OneNote keeps failing after the notebook opens in the browser, sign out and sign back in to OneNote for Mac:
      • OneNote > Sign Out
      • Then OneNote > Sign In
    6. If the issue started after the macOS update and the notebook still cannot be opened from OneNote for the web, check whether other OneNote notes can be found from OneDrive directly. If needed, report it through the OneNote forums on Microsoft Community.
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  2. Kai-H 27,725 Reputation points Microsoft External Staff Moderator
    2026-10-01T10:06:03.5033333+00:00

    (Please note that our forum is a public platform, and we will modify your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data.)

    Hi, Blair

    Sorry for this frustration. Seeing your notebook in OneDrive is encouraging, but a 404 can mean the notebook’s location or link has changed; the macOS update alone doesn’t establish the cause.

    Here are some suggestions you can try:

    Protect any notes still visible on your Mac first. If OneNote still displays pages from the notebook, copy important text into another document before clearing app data or reinstalling anything. In OneNote for Mac, also check File > Open Backups for a saved copy of its sections.

    In OneDrive on the web, check Recycle bin for the notebook or any missing folder and restore it if found. If this is a work or school account and it isn’t there, ask your IT administrator to check the second-stage recycle bin and the notebook’s location.

    If the notebook is still listed but won’t open, ask the owner or IT administrator to check whether it was moved, renamed, or deleted. Share the exact 404 message with them.

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