- Knowledge Base
- Accounts, Email & Support
- Duo
How to reactivate your phone for Duo.
- Knowledge Base
- Accounts, Email & Support
- Duo
How to use Duo with an offline cell phone.
- Knowledge Base
- Accounts, Email & Support
- Duo
Using Duo with a mobile device is the recommended option.
- Knowledge Base
- Accounts, Email & Support
- Duo
How to add, remove, reactivate or deactivate Duo devices.
- Knowledge Base
- Accounts, Email & Support
- Duo
What to do if you forgot your Duo device.
- Knowledge Base
- Accounts, Email & Support
- Duo
Duo hardware tokens are a good option if you don't have a smartphone, or if you need a second Duo device.
- Knowledge Base
- Accounts, Email & Support
- Duo
How to replace a phone used for Duo two-step authentication.
- Knowledge Base
- Accounts, Email & Support
- Duo
How to confirm you are enrolled in Duo two-step login.