A knowledge base article about I had Duo Mobile set up on my smartphone already, but it is no longer working. What can I do? provided by the UC Berkeley IT Service Hub - Knowledge Portal
In order to fix this issue, please re-enroll your device. Ensure you have backup passcodes ready, and then delete the Duo application from your phone. Reinstall it as a new device – instructions can be found on the 2-step page of our website.