Only applications that support Microsoft's Modern Authentication libraries are able to prompt for Duo two-factor authentication. This is a Microsoft -- not Duo -- limitation.
Mobile applications that support Modern Authentication libraries are as follows:
- The native Mail app on iOS 11.x+
- Microsoft Outlook app on iOS version 10.x and greater
- Microsoft Outlook app on Android
Note: If your smartphone mail app keeps prompting you for your email password, please read "Issues with email on my smartphone" under the "General Issues and Troubleshooting" tab
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