A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
Hello, Mauricio Andrews
This indicates that the notebook is indeed no longer present in your account, but somehow it has not fully synchronized with the OneNote desktop app yet. If it was shared with you by someone else, please contact the owner.
If it’s a notebook you created yourself, try looking in the Recycle Bin on the OneDrive website, or attempt to restore a previous version of OneDrive (How to restore your OneDrive - Microsoft Support). If that still doesn’t work, then unfortunately, there’s no other solution, and you’ll have to start over.
Yuhao Li
Microsoft Community Technical Support