Briefly: After logging out of all my Microsoft accounts in OneNote I was still able to open/browse OneDrive files, private to those accounts, from the recently used list.
While using OneNote 2016 (Office 365 ProPlus, Windows 10 1803) at work, logged in with my work LiveID, I needed temporary access to my personal OneNote notebook, so within OneNote I logged into my other account, retrieved the information, and closed the notebook. Later I noticed that I could open my personal notebook and browse my OneDrive files from the recently used files menu without a password prompt. I tried the following to clear my cached credentials to no avail:
- OneNote 2016 Account settings - Sign out of my personal account, switch to my work account, verify that "Switch account" does not show my personal account. Restart Windows. Also signed out of work account.
- My Office (app) - Search the My account page for options to log out of my personal account.
- Log into https://onedrive.live.com and verify none of my files/folders are shared.
- Log into https://account.microsoft.com and verify my computer is not listed under "Devices"
- Repair - Repair Office from Windows Control Panel [suggested by the IT department] - I tried both "normal" and "online" repair, which reinstalled Office.
- Windows Credential Manager - From this application I deleted all credentials starting with "MicrosoftOffice" and "OneDrive Cached Credential".
- An SU post mentions Microsoft Live ID Sign-in Assistant, which sounds great, but is apparently not available on desktop Windows(?)