How do I use SMS text messages with Duo?


Duo is capable of texting passcodes to your mobile phone number, if you have one enrolled for your account. Each text message contains 6 passcodes. Each passcode can be used once and does not expire.

Important! Duo SMS passcodes cannot be used if you enrolled in Secure MFA, which blocks Duo voice and SMS authentication methods. See What is Secure MFA? for more information.

Obtaining Passcodes

When presented with the Duo prompt, click "Enter a Passcode".

Duo login prompt

A blue bar appears at the bottom of the prompt. Cick "Text me new codes". Duo texts a set of passcodes to your mobile phone number.

Duo prompt, entering a passcode

Passcodes do not expire until used. Since Duo sends 8 passcodes each time, you can save the remaining 7 and use these for future authentications if desired.

To use passcodes with the VPN, please refer to


Article ID: 1006
Fri 7/20/18 12:25 PM
Thu 6/3/21 2:34 PM