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How to get a temporary Duo code ahead of time.

How to reactivate your phone for Duo.

Get signed up for Duo two-step login!

Troubleshoot common Duo login issues.

How to use Duo two-step login with Linux/Unix shell servers.

How to resolve Duo push notification issues.

Troubleshoot problems installing the Duo Mobile app.

How to add, remove, reactivate or deactivate Duo devices.

Duo - Replace a Phone

How to replace a phone used for Duo two-step authentication.

Using Duo with a mobile device is the recommended option.

What to do if you forgot your Duo device.

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