Outlook Office 365 – Modern Authentication Issues

Office 365 Modern Authentication Promp

I have seen many reports of Outlook 2016 – Office 365 asking for a password.  The user enters their email address using Microsoft’s “Modern Authentication”, but the next screen asking for the password  disappears.  This of course prevents the user from authenticating to the Office 365 Exchange servers.

Close all Microsoft Office applications.
Turn off the modern authentication by adding the following DWORD (32) to the registry:

HKCU\SOFTWARE\Microsoft\Office\16.0\Common\Identity\EnableADAL

Make sure the value is set to 0 (zero).  It should default to this value.

Restart the offending Microsoft Office application, Outlook is generally where the issue is most prevalent. You will then get the legacy authentication prompt, similar to the below image.

In the future, Microsoft may require the Modern Authentication.  For now, this will get you around the authentication bug.

This article is intended for advanced users and/or I.T. professionals.  Modifying the registry can cause your computer to become inoperable.

If you need assistance, send an email to info@haysleyconsulting.com or call 502.791.6093.

Visit http://haysleyconsulting.com or https://www.facebook.com/haysleyconsulting for information about our services. Haysley Technology Consulting is a Bullitt & Jefferson County Computer Service provider.

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