Office 2013 makes a best effort to prevent a second user from signing in when another user from the same organization is already signed in. The outlook is trying to log into Office 365 even though it is connected to the exchange server, which is why the login details never would be accepted but outlook stays connected.

Use phone sign-in and the Authenticator app. Even if you purposely entered the wrong password the AD account won't get locked out. If you still can't get back in to your account, find your issue below and expand that section for help. If you're having trouble signing in to your Office 365 email account, you've come to the right place. However, Office 2013 only supports one Office 365 user sign-in from each tenant or organization per session. If you can't sign in to the portal, use one of the solutions in the following table, as appropriate for your situation. To check if your Microsoft account is associated with Office, sign in to Services & subscriptions. So it isn't a common issue. Your Office product or Microsoft 365 subscription should be listed there. You can't sign in to the portal. If it's not, your email address won't work for signing in to Office. Click "Show advanced settings..". For more information about how to troubleshoot sign-in issues that use non-browser–based apps, see How to troubleshoot non-browser apps that can't sign in to Office 365, Azure, or Intune. Step 2: Check for multiple copies of Office. You'll need to scroll down a bit to find it. Review the table below to help find the best solution for your situation. Want to sign in securely without a password next time?