A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
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.
I’m sorry to hear that you’re unable to access your OneNote notebook, especially if it contains important information.
To help narrow down the cause, could you please confirm whether you created the notebook yourself or whether it was shared with you by someone else? Also, are you able to access your other OneNote notebooks normally using the same Microsoft account?
Please let us know which OneNote version and device you are currently using, and whether the issue started after any recent changes to your account, such as changing the password, primary alias, or security information. It would also be helpful to know whether you are opening the notebook from the Recent list, an old bookmark, or a shared link.
If only this notebook is affected, the issue may be related to its ownership, sharing permission, or an outdated link rather than the Microsoft account as a whole.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.