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Sign in using the @domain.onmicrosoft.com format email address (shown when you login to the Admin center).
This will open a fresh authentication session over the Outlook app. Change that email to the real email address and login here. This should complete and Outlook will then be signed in properly. I found this fix here and it worked: https://learn.microsoft.com/en-au/answers/questions/1828324/unable-to-setup-email-on-outlook-mobile-applicatio | |
| Search Keywords: Microsoft 365 Work or School Email Account, outlook mobile | |