Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
The following works for me:
- Logoff from OneNote completely.
- Uninstall M365 and OneNote. (I didn't uninstall OneNote for Windows 10 (abbr 1N4W10) though as I was afraid I might lose total access to my notebooks if 1N4W10 also screws up.)
- Execute the steps as in Method: Use scripts to automate the cleanup process.
- Reinstall M365.
That's it. Much thanks to the original poster and subsequent posters for this thread for sharing their experiences.