A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
If the items do not exist in OneDrive anymore, cannot be opened, and do not give you any delete/share options, then this is probably not something you can fully fix from the OneNote app. A notebook normally has to be deleted from OneDrive first, then closed from the OneNote desktop app, otherwise OneNote may keep trying to sync a notebook that no longer exists.
In your case, since support already collected HAR logs/screenshots and escalated it as corrupted or orphaned metadata, the next step should be to reply to the same support case, not open a brand-new one if possible. Include the case number, the date it was escalated, and say clearly that the promised developer follow-up has not arrived. Ask them to check the escalation status and re-queue it if needed.
It is recommended that you also check the same Microsoft account on OneDrive web, OneNote web, and the desktop app, and remove/close the notebook from all places where that option still appears. It is also suggested that you check whether the ghost items belong to another signed-in personal/work account, because OneNote can show notebooks from multiple accounts.
If there is truly no file behind the entries, then only Microsoft backend support can remove or repair the orphaned references. In that situation, I would keep the existing ticket active and ask for an update from the escalation team.
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Thank you for your patience in reading, I hope this information has been helpful to you.
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