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I have had problems using OneNote 2016 desktop app for a few days recently. My shared notebooks were not properly synced online, presumably due to me not being logged in. The program has indeed asked me for my login credentials.
However, even though I have used the correct username and password, it did not seem to remedy the issue, as if the login attempts were completely futile. Restarting Windows did not help as well. How can the problem be remedied?