DUO - A new Phone


When you decide to upgrade or change your phone, DUO Device Management allows you to easily edit devices.

To change your device, sign into a web-service that utilizes the Central Authentication Services (CAS) page to reach the DUO choose an authentication method screen. From there, click on My Devices & Settings and complete two-factor authentication (you may need to scroll down to see all authentication options) to continue with changing your device. 

If you cannot sign in or authenticate via DUO, please contact the CMC Help Desk for further assistance.


1.    Login to the Central Authentication Service (CAS) on your computer.

Faculty and Staff:
Go to Workday to login through the CAS.

Sign into your E-Mail to login through the CAS.

Select Claremont McKenna College from the Institute drop down list, enter your CMC username and password, then click on Login.

The Claremont Colleges Central Authentication Service with example login prompt for CMC users “ASmith”

2.    From the DUO authentication screen: 

On the left hand pane, click on My Settings & Devices.

CMC Duo “Choose an Authentication Method” page with blue text with red band box “My Settings & Devices” to the left side of the page

You must confirm your identity before you can change a device.

From the Choose an authentication method section, click Send Me a Push, if you have your old device. Alternatively, click Call Me if you do not have your old device.

CMC Duo “My Settings & Devices” page Prompt with Choosing an authentication method to confirm it’s really you with arrow pointed to Send Me A Push

3.    Unlock your smartphone.

Duo Mobile Login Request from the CAS: (Central Authentication Service) on an iPhone iOS 10 interface

Open the DUO Mobile app and tap on the Request Waiting banner.

Duo Mobile app interface: With “1 Request Waiting. Tap to Respond” banner visible and arrow pointed to it and Duo-Protected Claremont McKenna College block underneath

Tap on the Approve button to complete the authentication. 

Duo Mobile app interface: Approve/Deny Login request powered by Duo Security coming from the CMC  CAS service with user “ASmith”, IP Address: 123.456.789.01 in the U.S. at 12:12:23 P.M. PDT on June 25, 2019 with arrow pointing to Approve

4.    On the next screen, click on Device Options next to the device you want changed.  

CMC Duo “My Settings & Devices” page with device overview with iOS Mobile phone, Generic Smartphone, and iOS Tablet device added to profile with arrow pointing to Device Options for iOS Mobile phone device

5.    If this is a new phone with the same number, click on the Reactivate DUO Mobile box. (For new phones with a new number: delete the old phone first, then add another device).

CMC Duo “My Settings & Devices” page with Device Options menu expanded out for iOS Mobile phone with options Reactivate Duo Mobile, Change Device Name, and Trash icon with arrow pointing to Reactivate Duo Mobile

6.    Select phone type and click Continue.

CMC Duo “What type of phone is” Page with red bandbox over iPhone with other choices Android, Windows Phone, Other(and cell phones) and arrow pointing to Continue

Then, click on I have DUO Mobile installed.

CMC Duo “Install Duo Mobile for iOS” prompt with arrow pointing to “I have Duo Mobile Installed”

DUO will regenerate a new QR code.

CMC Duo “Activate Duo Mobile for IOS” with red bandbox over QR code

7.    Install DUO Mobile on your mobile phone. 

Duo Mobile iOS App Store Search Result with Duo Mobile app article displayed with “OPEN” button

On your new mobile phone, install DUO Mobile for iOS or Android on your smartphone, available on the Apple App store or Google Play Store under DUO Mobile.  

Duo Mobile app Interface: “Welcome to Duo Mobile” page with arrow pointing to + icon on top-right corner and arrow pointing to “New to Duo? Add Account”

8.    Launch DUO and tap on Add Account button (or click on the + sign on top-right).  

Duo Mobile app interface: “Add Account” page with QR Code over area where camera is utilized by device to capture QR code

Use your smartphone camera to capture QR code.

9.    A green checkmark will appear over the QR code when complete. Then, click on Continue.

CMC Duo “Activate Duo Mobile for IOS” with green checkmark over QR code and arrow pointing to ContinueThe new phone (same number) is added and listed with your other enrolled devices.

Click on Back to Login box and proceed using DUO authentication method to login.

CMC Duo “My Settings & Devices” page with Mobile phone device readded with it set as Default Device and “Ask Me to Choose an authentication method” with arrow pointing to “Continue to Login”