If you are using multiple devices when providing your 2FA, you can use Append Mode. Append mode allows you to specify what device you would like the authentication request to be sent to. If you have multiple devices of the same type registered, you can add a number to the end of the device names.

For example, push2 will send a login request to your second phone, push3 will send a login request to your third phone, etc.

More information about this feature can be found in the Duo Guide.

If you are unable to access any of your devices, you may request an Emergency Bypass Code that will be sent to the alternate email that you used during enrollment