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- Go to the 2FA website (2fa.uchicago.edu).
- Navigate to Go to two-factor (Register and Manage Devices).
- Click the Re-activate button displayed next to your device's listing.
Having the Duo Mobile app already installed on your device before reactivating is helpful. More information is found in Register Your Smartphone in Two-Factor Authentication (2FA). If you'd like to add a landline or a tablet, the process is slightly different; see instructions to Register a Landline or Register a Tablet. It is important to register more than one device, if possible, to ensure that you continue to have access even if your primary device is unavailable.
If you're replacing your old device with a new one that uses a different operating system, for example switching from Android to iOS, or if you are changing your phone number, you'll need to remove your old device and then add the new one. To remove your old device from the 2FA website:
- Go to the 2FA website.
- Navigate to Go to two-factor (Register and Manage Devices).
- Next to your old device, select the Remove button.
- Then follow the Register a Device link in the left hand column to add your new device.
If you still have problems with Duo, please contact IT Services at itservices@uchicago.edu or 773.702.5800.