Outlook Desktop Me Control account manager does not sign in for on premise users running in a hybrid environment

Last Updated: June 11, 2025

ISSUE

When on-premises users open Outlook Desktop on Current Channel Version 2309+, they have a Sign in button shown instead of the expected profile picture. Selecting the Sign in button results in a password prompt, that will return a dialog showing "This email address has already been added" error when the user tries to log on with their credentials.

The error is expected as the user is already correctly signed in to Office/Outlook with a valid account. This issue only happens with Outlook Desktop. The other Office applications display the user and profile picture correctly.

STATUS: WORKAROUND

This issue is not planned for a fix. If that changes in the future, we will update this topic.

A way to resolve the issue is to enable Hybrid Modern Authentication. For more information reference these topics:

• How to configure Exchange Server on-premises to use Hybrid Modern Authentication

• Configure OAuth authentication between Exchange and Exchange Online organizations