one note data lost after resetting the app

Question

Hello,

I have a user whose local IT has reset the One Note app.

Now the data is gone, both in the cloud and local copy.

Is it really lost?

In time she has also changed her UPN.

But Onenote worked with her old UPN in the name.

Now the new Onenote is blank, with the new UPN, and the old OneNote with the old UPN says 404 when trying to access it.

But this one, with the old UPN was accessible until the app reset.

At this point the new file appeared, with no data, and the old one gone.

Thank you

Answer 1

Dear User,

Good day! Thank you for reaching out to the Microsoft Community. I'm here to assist you.

From your description, it seems that after resetting the OneNote app on Mac, all the data was lost from both local and cloud storage. Additionally, the user changed their User Principal Name (UPN), and now they are seeing a 404 error when trying to access the old OneNote. This indicates that the old notebook location is no longer accessible.

May I know if my understanding is right ? If so you can the try the suggestions given below :

• Follow the detailed steps given in the article : Find OneNote notes, pages or tabs - Microsoft Support

You can try the suggestions below accordingly:

• **Restore from OneDrive:**If the notebooks were stored in OneDrive, check the Recycle Bin for deleted files. Go to OneDrive > Recycle Bin > Look for deleted notebooks > Restore. More details please visit: Restore deleted files or folders in OneDrive
• 404 Error - Verify OneNote Notebook Link: You're getting a 404 error, it means the notebook no longer exists at the old location. Try using the old UPN email to sign in to OneNote Online and see if the notebook still exists. If the notebook was moved, ask the IT admin if they can restore the old UPN account or provide access to the new account.

If the issue still persists, I recommend reaching out to the Microsoft development team for further investigation from the backend. Since we have limited access to internal resources, the best way to get a resolution is through Microsoft Online Support. Please contact your IT administrator (How do I find my Microsoft 365 admin? - Microsoft Support) and ask them to raise a ticket. This will allow the Microsoft support team to check internal sources and investigate the issue further.

Thank you for your understanding and patience. Wishing you a good day ahead.

Sincerely,

Sophia