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 in our 2-Step guide: How to Get Started with 2-Step (KB0011939).
I had Duo Mobile set up on my smartphone already, but it is no longer working. What can I do?
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