OneNote seems stuck with keychain. Can't log in
I like to do a quick test by making a new user account on the Mac and log out of the user account with the problem, in to the new account and try launching and re-licensing the apps.

Outlook seems to pull the most reliable licenses, followed by Word / Excel / PowerPoint, but I don’t know you can’t start with OneNote - just that I typically use another app.

That being said - here is one official KB on fixing keychain permissions and three super helpful / open-source scripts to help with removing licensing entries so you can get a fresh launch. FWIW - reinstalling almost never fixes a license or keychain issue, but it does solve other issues from time to time, so good you ruled that out already.


https://support.office.com/en-us/article/office-for-mac-repeatedly-requesting-keychain-access-ced5a09c-3099-47cb-9190-e961bf63e240
https://github.com/pbowden-msft/NukeOffKeychain
https://github.com/pbowden-msft/Unlicense
https://github.com/pbowden-msft/FlightReset


I like to start with nuking the keychain first, then proper clean unlicensing and if all else fails, resetting the flight (Insider slow / fast / etc...). You might check what license you have before starting - it would be good to be clear if your’re a serialized volume license, O365 or other licensing scheme.