Duo

Information on two-factor authentication, device enrollment, configuration, and troubleshooting.

Categories (3)

Android

Knowledge base articles for android devices and Duo
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Apple

Knowledge base articles for Apple devices and Duo
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Troubleshooting Guides

General troubleshooting guides for Duo Mobile and Push
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Articles (12)

Authenticating with the Duo Prompt

Overview of authentication using the Duo Prompt.

Duo Enrollment Guide

Overview of Duo enrollment

Duo Mobile Access Issues Caused by Expired DigiCert Certificates (Unsupported Devices)

Some Duo Mobile authentications may fail on older or unsupported devices due to expired security certificates. This article explains who is affected and what steps to take to restore access.

Duo Restore

Overview of Duo Restore

Duo-Protected Applications VS. Third-Party Accounts

Duo-protected versus third-party applications. What's the difference?

Managing Your Devices on Duo

Overview of managing, adding and removing devices on Duo.

Supported iOS and Android Versions for Duo Mobile

Duo Mobile requires supported versions of iOS and Android to maintain security and reliability. As of April 16, 2026, Duo Mobile will no longer support iOS 16 or Android 11. Users should update their mobile devices to iOS 17 or Android 12 (or newer) to continue receiving security updates and full support.

Third-Party Accounts and Duo

Two-Factor Authentication (TFA)

Introduction to two-factor authentication and Duo.

Using Duo Verified Push

Learn how to use Duo Verified Push to securely approve login requests using number matching in the Duo Mobile app.

Using Duo with a Hardware Token

Overview of Duo with a Hardware Token

What to Do If You Receive an Unexpected Duo Prompt

Provides guidance on safely handling unexpected Duo authentication prompts and protecting your SFA account.