Office 365 Apps Suddenly Stopped Working

Updated 1 month ago by Andrew Hill

Easy Fixes

  • Did you change the password for that account? Microsoft will invalidate tokens granted with credentials that are no longer valid. Simply remove the account and sign back in with your new credentials
    • WARNING - that will result in pulling old data, so this may require some triage if you haven't set up whitelisting
  • Did you enable Two-Factor Authentication (2FA/MFA) on the admin account? It may be that we are trying to pull your data, but 2FA requests are failing because it is an automated system.
Please DO enable MFA for all other accounts, as this is a good security policy and can protect your data from compromise even if an adversary learns your login and password.
NOTE - The preferred means of enabling these apps is to create an admin account which is used only for this purpose, and is not the account you normally use for admin actions. This has the dual benefits of ensuring that any normal admin actions taken by this account can be viewed as suspicious, and reducing the likelihood that either admin account will be compromised.

  • If neither of these are the case, try removing and re-adding the Microsoft credentials (in the configuration menu). Just liike turning a computer off and on again, this fixes nearly every problem
    • WARNING - that will result in pulling old data, so this may require some triage if you haven't set up whitelisting

Not-As-Easy Fixes

  • If you regain Secure Score and Azure AD functionality, but there are no events on Malicious Login Detector, verify that the account you have used to log in has an Azure Premium P1 or P2 license assigned to it.
  • If none of these actions restore functionality for your Office 365 apps, contact support.


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