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Troubleshoot common Duo login issues.

Passcode authentication, which uses a numeric passcode generated by a hardware token or the Duo Mobile app, will no longer be available starting May 1, 2024. This method has been identified as vulnerable to phishing attacks. If you use passcodes generated by a hardware token or Duo Mobile, please switch to a different authentication methods.

How to resolve Duo push notification issues.

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

How to reactivate your phone for Duo.

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

Using Duo with a mobile device is the recommended option.

Get signed up for Duo two-step login!

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

How to get a temporary Duo code ahead of time.

Can I opt out of Duo?

Troubleshoot problems installing the Duo Mobile app.