In some configurations, applications and services that don't support the inline Duo Prompt or a secondary passcode field automatically send a Duo Push request or phone call to your first supported two-factor device.
How to Use Auto Mode
Enter your username and password at the application's login prompt as usual.
If you don't have Duo Mobile activated but you have a phone capable of receiving calls registered in Duo, you'll automatically receive a phone call from Duo requesting login approval. Follow the instructions provided in the verification phone call to complete signing in to the application or service.
If you have multiple devices associated with your Duo user, the Duo Push or phone call login request gets sent to the first available device that supports one of these methods.
Choosing a Different Device or Method
If your Duo administrator allows it, you can override Duo's automatic authentication device selection by appending the name of a specific device or a passcode to your application password. It will look something like this:
In place of authentication_method:
|password,passcode||Log in using a passcode, either generated with Duo Mobile, sent via SMS, generated by your hardware token, or provided by an administrator.
|password,push||Push a login request to your phone (if you have Duo Mobile installed and activated on your iOS, Android, or Windows Phone device). Just review the request and tap "Approve" to log in.|
|password,phone||Authenticate via phone callback.|
|password,sms||Get a new batch of SMS passcodes.
Your login attempt will fail — log in again with one of your new passcodes.
You can also add a number to the end of these factor names if you have more than one device registered. For example, push2 will send a login request to your second phone, phone3 will call your third phone, etc.
To use Duo Push on your second phone instead of letting Duo select the authentication type for you when your password is "hunter2", type:
To use the passcode "123456" instead of letting Duo select the authentication type for you when your password is "hunter2", type:
To send new SMS passcodes to your second phone if your password is "hunter2", type:
The comma is Duo's default separator character between your password and the Duo factor. Your administrator may have changed this to a different character. Be sure to follow the instructions sent to you by your organization if they differ from what's shown here.