OneNote Gem Add-Ins

Why didn't use for a few months, cannot open any OneNote files now?

Qustion:

I was using onenote for yearsfor my uni, but I didn't use for a few months now. 
 
Today, I checked my notes from past and I can't open any of my notebooks. 
 
They look in onenote onedrive but when I try to openit says:
 
Sorry, something went wrong. Item does not exist. It may have been deleted by another user. 
 
Technical Details: Troubleshoot issues with Microsoft SharePoint Foundation. 
Correlation ID: 
Date and Time: 6/18/2026 9:26:57 AM
 
I didn't delete any notebooks, and I am pretty sure that they were saved in cloud since I was using the same notebooks both in web and mobile app
 
I am not using a school account but I'm using my personal one.  I can see all the notebooks and I am sure that I didn't delete anyfiles from my onedrive. But I cannot open them

 

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