We are having outlook authentication issues during sign in for Android and iOS Apps

2024-03-27T17:09:13.3366667+00:00

Hi Team,

Since yesterday, users in our organisation are no longer able to sign into the Outlook apps on iOS or Android. We use basic Authentication to sign into our Exchange and currently we are on-premise. I have seen a couple of posts now floating around regarding this so can a community member advise if this is a known issue and is there any solutions or a central area to get updates on this please ? Just to advise, we are having no problems using the Samsung Mail or Apple Native apps to sign into our Corporate emails.

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  1. Aleksei Kouznetcov 10 Reputation points
    2024-03-29T06:02:40.21+00:00

    The solution, as always, can be found on reddit, but not here.

    Please, read: "Outlook for iOS and Android - an error occurred during authentication"

    https://www.reddit.com/r/Outlook/comments/1bp044h/outlook_for_ios_and_android_an_error_occurred/

    So, if you hosting local AD domain like microsoft.local or somthing like that, which is differ from your e-mail domain microsoft.com. In this case, you must retire this discrepancy.

    You must ensure that Outlook users have an AD UPN that matches their email exactly.

    Just Add Alternative UPN suffix in Active Directory Domain and Trust snap-in.

    After that change user logon name and domain suffix in Exchange admin center.

    Easter egg from M$. Happy Easter!

    1 person found this answer helpful.