Passcode via text message is only available upon request and is not the preferred 2FA authentication method because of the increase in SIM card swap scam.
Step 1: At the Duo prompt, please click on Enter a Passcode
Step 2: At the bottom right corner of the window, click on Text me new codes
Step 3: A one-time passcode is sent to your registered phone number via SMS text messaging. Enter the passcode and click on Log In. A one-time passcode cannot be re-used.
To reduce how often 2FA is required on a particular trusted device, you can enable the Remember me for 30 days setting by checking the box.
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