Microsoft Office 365 - Login error that another user is already logged in
Issue
When trying to log in to activate Microsoft Office 365 apps on a Windows computer, you may get an error that the login failed because another user is already logged in, despite logging in correctly and with an active account.
Resolution
Open a Microsoft Office 365 app, such as Word
Go to the File menu and select Account on the left
Screenshot of Word's File menu highlighting the Account itemClick Sign Out
Screenshot of Word's Account pane highlighting the Sign Out buttonClose and reopen the app
Choose to sign in to activate Microsoft Office 365 again
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