Options for Two-Factor Authentication

This document describes the options available with Duo for two-factor authentication and includes links to enrollment instructions for each option.

We recommend that you enroll in a primary option plus at least one backup option. During each login session, you can choose which of your enrolled options to use. (For login instructions, see Using Duo Two-Factor to Log In.)

​The Duo Mobile app meets web accessibility requirements. If you need assistance choosing an option that will best accommodate a disability, please contact sites.knox@umich.edu.

Contents

Duo Mobile App on a Smartphone

Enrolling the Duo Mobile app on a smartphone (a cell phone that allows you to download and install applications) gives you the greatest number of options when you log in to a two-factor-protected system. Most people find the push notification the most convenient option.

Push Notification Generate an Offline Passcode Phone Call Passcodes via Text Message
Duo Push

From the login page, click Send me a Push, open the push notification on your smartphone, and tap Approve to log in. Requires WiFi or mobile data connection. Duo Mobile Push uses a minimal amount of mobile data—less than 2 KB per authentication.
Duo Passcode

No WiFi or mobile data connection needed! The app generates a passcode for you. When you log in and are prompted for two-factor, click the Enter a Passcode button, enter the passcode from the smartphone, then click Log In.
Duo Phone Call


From the login page, click Call Me, answer the call on your phone, and press 1 to log in. 

Passcodes via Text Message

From the login page, click Enter a Passcode, click Text me new codes, and receive a text message that includes 10 passcodes. Enter your passcode on the login page, and click Log In. Ten passcodes are sent because each can be used only once. Passcodes expire after 30 days.

Enrollment Instructions: Enroll a Smartphone or Tablet in Duo
How-to Video: Introduction to Two-Factor Authentication at U-M (1:42)
How-to Video: Use Offline Passcodes for Travel (1:08)
Supported Device OS Versions: iPhone, Android, Windows Phone

Duo Mobile App on a Tablet

A tablet provides two options with the Duo Mobile app.

Push Notification Generate a Passcode
Duo Push

From the login page, click Send me a Push, open the push notification on your smartphone, and tap Approve to log in. Requires WiFi or mobile data connection. Duo Mobile Push uses a minimal amount of mobile data—less than 2 KB per authentication.
Duo Passcode

No WiFi or mobile data connection needed! The app generates a passcode for you. When you log in and are prompted for two-factor, click the Enter a Passcode button, enter the passcode from the smartphone, then click Log In.

Enrollment Instructions: Enroll a Smartphone or Tablet in Duo
Supported Device OS Versions: iPad, Android

Duo Mobile App on an Apple Watch

An Apple Watch that you have paired with an iPhone with the Duo Mobile app provides two options.

Push Notification Generate an Offline Passcode
Duo Applewatch

From the login page, click Send me a Push, open the push notification on your Apple Watch, and tap Approve to log in. Requires WiFi or mobile data connection. Duo Mobile Push uses a minimal amount of mobile data—less than 2 KB per authentication.
Duo Applewatch 2

No WiFi or mobile data connection needed! The app generates a passcode for you. When you log in and are prompted for two-factor, click the Enter a Passcode button, enter the passcode from your Apple Watch, then click Log In.

Enrollment Instructions: Enroll a Smartphone or Tablet in Duo to enroll the paired iPhone. Then use the companion Watch app on the iPhone to show the Duo app on your Apple Watch.
Supported Device OS Versions: iPhone, Apple Watch

Duo Push Notifications on an Android Smartwatch

There is not a standalone Duo Mobile app for Android smartwatches, but you can approve authentication requests on your watch via the notification.

Android Smartwatch
Android Smartwatch

From the login page, click Send me a Push, open the push notification on your Android Smartwatch, and tap Approve to log in. Requires WiFi or mobile data connection. Duo Mobile Push uses a minimal amount of mobile data—less than 2 KB per authentication.

Enrollment Instructions: Enroll a Smartphone or Tablet in Duo to enroll an Android phone that you have paired with an Android smartwatch. Ensure that notifications are enabled on your phone and that your watch is paired with your phone. To approve authentications, your phone must be unlocked. If your phone is normally locked, you can enable Smart Lock in order to approve notification actions.

Other Cell Phone—Phone Call or Text

Cell phones with text messaging and phone service provide two options.

Phone Call Passcodes via Text Message
Duo Phone Call


From the login page, click Call Me, answer the call on your phone, and press 1 to log in.

Passcodes via Text Message

From the login page, click Enter a Passcode, click Text me new codes, and receive a text message that includes 10 passcodes. Enter your passcode on the login page, and click Log In. Ten passcodes are sent because each can be used only once. Passcodes expire after 30 days.

Enrollment Instructions: Enroll a Landline or Non-Smart Cell Phone in Duo
How-to Video: Use a Phone Call (0:36)
How-to Video: Use Text Passcodes (0:39)

 

Landline Phone Call

Phone Call
Duo Phone Call


From the login page, click Call Me, answer the call on your phone, and press 1 to log in.

Enrollment Instructions: Enroll a Landline or Non-Smart Cell Phone in Duo
How-to Video: Use a Phone Call (0:36)

Duo Hardware Token

Hardware tokens are available from the Computer Showcase. The university will cover the cost of an initial hardware token for individuals who cannot use the Duo Mobile app or other phone options. Individuals can purchase additional or replacement hardware tokens (need-based exceptions are considered on a case-by-case basis).

Passcode
Duo hardware token

From the login page, click Enter a Passcode. Press the button on your Duo hardware token to generate a passcode, enter your passcode on the authentication page, and click Log In.

Enrollment Instructions: Get and Enroll a Hardware Token or YubiKey
How-to Video: Use a Hardware Token (0:48)

YubiKey

A YubiKey is inserted in the USB port of your computer for touch-based authentication. To use it, click Enter a Passcode on the Duo authentication screen, touch the YubiKey to add a letter-based passcode in the passcode field, and click Log In or press Enter on your keyboard. Choose a YubiKey that's right for you based on the type of USB port in your computer and whether or not you will leave the YubiKey in your computer.

  • USB-A USB-A
  • USB-C USB-C

Only YubiKeys obtained from the Computer Showcase are compatible with U-M. The university will cover the cost of an initial YubiKey for individuals who cannot use the Duo Mobile app or other phone options. Individuals can purchase additional or replacement YubiKeys (need-based exceptions are considered on a case-by-case basis).

YubiKey USB-A YubiKey Nano USB-A YubiKey USB-C YubiKey Nano USB-C
Duo Push

Designed to fit on your keychain. Fits USB-A computer ports.

Available from the Computer Showcase.

Duo Passcode

Designed to stay in your computer. Fits USB-A computer ports.

Available from the Computer Showcase.

Duo Phone Call

Designed to fit on your keychain. Fits USB-C computer ports.

Available from the Computer Showcase.

Passcodes via Text Message

Designed to stay in your computer. Fits USB-C computer ports.

Available from the Computer Showcase.

Enrollment Instructions: Get and Enroll a Hardware Token or YubiKey
How-to Video:​ Use a YubiKey (0:28)

Temporary Bypass Code

When you don't have any of your Duo options available to you, you can phone the ITS Service Center for a temporary bypass code.

  1. Phone the Service Center at 734-764-HELP (764-4357).
  2. The Service Center can issue a bypass code that is good for use when your device isn't available or while traveling.
  3. You will be asked to verify your identity by providing information such as your date of birth.
  4. When you log in and are prompted for two-factor, click the Enter a Passcode button, enter the passcode, then click Log In. If the Enter a Passcode button does not appear at first, refresh your browser window.
Last Updated: 
Wednesday, May 15, 2019