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From what you described, this does not sound like a normal local OneNote cache problem anymore. Since the old notebook comes back after clearing the local MRU/cache folders and even survives different PCs, it is most likely an old account-side “recent notebook” or orphaned OneDrive/OneNote pointer.
Here are some suggestions you can try:
First, open the full OneNote desktop app and check File > Open > Recent or More Notebooks. If “Alex” appears there, right-select it and choose Remove from list or Close this notebook.
It is also recommended that you check OneDrive on the web and https://www.onenote.com/ for any “Recent”, “Manage and delete”, or old notebook entry, then remove it there if shown.
If the notebook still reappears after that, I’d include the exact old d.docs.live.net/.../%5e.Documents/... path when contacting Microsoft Support. At that point, it likely needs Microsoft to clear the orphaned server-side notebook reference from your Microsoft account metadata, because normal local cache cleanup will not remove it permanently.
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Thank you for your patience in reading, I hope this information has been helpful to you.
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