3. Disable Modern Authentication on affected machine.
Open Run – Regedit and go to the location: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity.
Create a DWORD with the name EnableADAL and set it to 0.
Note: ADAL enables sign-in features such as Multi-Factor Authentication (MFA), smart card, and certificate-based authentication for Office client apps across different platforms.
4) Under the same registry key location, create a DWORD with name DisableADALatopWAMOverride and set it to 1.
Reboot the machine after making the above change as registry won’t refresh automatically.
The above reg key disables WAM (Web Account Manager) use in Office, which degrades the auth experience.
Note: On Windows devices, some of the security-related features are available exclusively via WAM and are otherwise not possible. Additionally, all future innovations will be implemented on WAM.
After following the above steps try opening Outlook and I hope the password window will be stable to let you enter the credentials. Once entered it will be saved and will show you Connected to Microsoft Exchange.
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