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

1. Open a Microsoft Office 365 app, such as Word.

2. Go to the File menu and select Account on the left:

   Open

   

   Screenshot of Word's File menu highlighting the Account item

3. Click Sign Out:

   Open

   

   Screenshot of Word's Account pane highlighting the Sign Out button

4. Close and reopen the app.

5. Choose to sign in to activate Microsoft Office 365 again.