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These instructions will also work if you need to activate the Duo mobile app

NOTE: Steps for activating the duo mobile app have changed recently. If you are a student please follow the link in the student section below. Everyone else can skip down to what form of authentication do you plan to use.

Duo Mobile app is supported on iOS 15 or greater and Android 11 or greater.

Students (Current, incoming, abroad)

Please go to the link below for steps on how to activate the Duo Mobile App. These steps have changed so please follow them closely. You will also follow the steps in the article below if you are a student and it says you need a QR code from the Tech Desk to activate your Duo Mobile app.

How do I activate Duo Mobile on my phone (Student)?

What form of authentication (used to verify identity) do you plan to use?

For everyone but students, click on the situation below that applies to how you will authenticate during the setup process. For more information on Duo Security check out this Duo Security FAQ article.

1. I have the same phone number and can receive a text message

2. I have the same phone number and I have a code generator or Yubikey

3. I have a different phone number

4. None of the situations above apply

Reactivating Duo Mobile - SMS Passcode Method

Reactivating with the same phone number by receiving a text message

On your new smartphone, download and install the Duo Mobile app from your device app store. If you already have Duo Mobile installed, you can skip the installation step.
Open a browser and go to a page like my.bucknell.edu or mail.bucknell.edu. You'll be prompted for your username and password.
- If you're already logged in to one of these services, switch to a different browser (Edge, Chrome, Safari, Firefox) or use an incognito/private browser.
When Duo tries to authenticate, select Other Options
Select Manage Devices
You will need to verify yourself. Select Text message passcode.
Enter the code texted to your smartphone in the passcode field box. If you do not get the passcode, select send a new passcode and enter the code sent via text.
Once verified, you will see a list of devices on your Duo account. Select I have a new phone under the device phone number you need to reactivate.
Note: Device type (Android, iPhone, etc.) will update after you reactivate your new smartphone.
Select Get started on the "Let's set up your phone" screen
Select Send me a passcode to confirm ownership of the smartphone
Enter the passcode texted to your device and select Verify
- If you get an error that says to contact IT, select Back and try again
Download the Duo Mobile App and select Next
The next step will vary depending on what device you started the reactivation process on.
- Computer: If using a computer, click here to go to the next set of directions.
- Mobile: If using a mobile device, click here to go to the next set of directions.

Reactiving Duo - Code Generator or Yubikey

Reauthenticate with the same phone number using a Code Generator or Yubikey

Download and install the Duo Mobile app from your device app store, if you do not already have Duo Mobile installed.
Open a browser and go to a page like my.bucknell.edu or mail.bucknell.edu. You'll be prompted for your username and password.
- If you're already logged in to one of these services, switch to a different browser (Edge, Chrome, Safari, Firefox) or use an incognito/private browser.
When Duo tries to authenticate, select Other Options
Select Manage Devices
You will need to verify yourself. Select Hardware Token
Enter the code from your code generator in the passcode field box. If you use a yubikey, it will auto-generate the passcode when you put your finger on the "Y".
Once you are verified, you will see a list of devices on your Duo account. Select I have a new phone under the device phone number you need to reactivate.
Note: Device type (Android, iPhone, etc.) will update after you reactivate your new smartphone.
Select Get started on the "Let's set up your phone" screen
Select Send me a passcode to confirm ownership of the smartphone
Enter the passcode texted to your device and select Verify
- If you get an error that says to contact IT, select Back and try again
Download the Duo Mobile App and select Next
The next step will vary depending on what device you started the reactivation process on.
- Computer: If using a computer, click here to go to the next set of directions.
- Mobile: If using a mobile device, click here to go to the next set of directions.

Unable to authenticate using any of the methods

No access to one of the authentication methods

If you are not a student and are not located in Lewisburg, please submit a Tech Ticket.
If you are local to the Bucknell campus, you can come to the Tech Desk with your photo ID and a staff person can help you add another number, or provide you an alternative source of authentication, like a code generator.

Add your Account to Duo Mobile App

The next step will vary depending on what device you started the reactivation process on.

Computer: If using a computer, click here to go to the next set of directions.
Mobile: If using a mobile device, click here to go to the next set of directions.

If you started this process using a computer to do the first 10 steps continue with the steps below

Switch to your smartphone.
On your smartphone, open your Duo Mobile App (enable camera if asked).
- If you do not have an account listed click on Add Account (+)
Click on Use QR code
Go back to your computer and hold your smartphone up to the screen to scan the QR code.
When the QR code is successfully scanned you will see an account pop up in Duo Mobile. Save the account.
Congratulations! You have successfully reauthenticated Duo.