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How to add, remove, reactivate or deactivate Duo devices.
How to replace a phone used for Duo two-step authentication.
Duo hardware tokens are a good option if you don't have a smartphone, or if you need a second Duo device.
Alternate contact information is used to recover your ONID account when you lose or forget your password.
The process for changing your ONID password if it is known, unknown, or expired.
Troubleshoot common Duo login issues.
How to use Duo with an offline cell phone.
Using Duo with a mobile device is the recommended option.
How to remove or replace a hardware token.