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0D54z0000A4qemDCQQOkta Classic EngineAuthenticationAnswered2026-02-17T09:00:23.000Z2024-05-22T19:33:36.000Z2024-05-31T19:46:08.000Z

ChristopherM.42189 (Customer) asked a question.

Unable to login to Outlook on iPhone, receive "Unable to sign in" error

The workflow is as follows:

The user receives the "Sign in" banner in Outlook on iOS and taps it

The user receives the Microsoft Authenticator "Open Authenticator" button and taps it

The user is prompted for their email/OKTA password in Outlook on iOS

User inputs their password into the OKTA sign-in pop-up

User receives, "Unable to sign in" error

 

There are no failed or invalid sign in attempts in their OKTA sign in logs and Microsoft sign in logs

The user is able to login to their OKTA dashboard on their computer successfully (MyOrg.okta.com)

The user is able to login to every other service federated in OKTA without issue on their computer

The only fix we have identified is to have the user reset their password on their end or have IT reset their password

 

Troubleshooting that has not worked:

Verified that users OKTA accounts are not locked

Verified that their password is not expired

Restarting the phone

Performed a forced restart on the phone

Performing an account reset in the Outlook app

Removing the Outlook account from the app and re-adding it

Deleting and reinstalling the Outlook app

Date and time is on "Set Automatically"

Network connection is stable

 

Several users in our organization have reported the same issue.

Same issue as the following post:

https://support.okta.com/help/s/question/0D54z00007HZ0bhCAD/unable-to-sign-in?language=en_US

https://support.okta.com/help/s/question/0D54z000075XpJrCAK/okta-not-logging-in-on-iphone-outlook-app?language=en_US


This question is closed.
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Unable to login to Outlook on iPhone, receive "Unable to sign in" error