Overview
This article explains how to get passcodes via text message (SMS) to use for Duo authentication.
Prerequisites
First, you’ll need to register a cell phone for Duo without the mobile app.
Instructions
When you log in to a Duo-protected service and get the Duo prompt, click the Enter a Passcode button.
![Click Enter a Passcode](https://service.uoregon.edu/TDPortal/Images/Viewer?fileName=2677d76c-de5e-4b6b-bf37-c282bd73f910.png)
Note: If you have Duo set to automatically choose one authentication method, click
Cancel to proceed.
![Press Cancel to disable automatic settings](https://service.uoregon.edu/TDPortal/Images/Viewer?fileName=182b5294-a996-43cd-87eb-2529a079a65d.png)
At the bottom of the Duo prompt, you should see a panel that will ask you to send passcodes via text message, click on the Text me new codes button.
![Click the Text me new codes button](https://service.uoregon.edu/TDPortal/Images/Viewer?fileName=9a8e80e0-02e1-4600-9a3a-1d2f05fdf832.png)
This will send three codes to you via text message that will expire in 30 minutes.
![Duo passcodes via text message](https://service.uoregon.edu/TDPortal/Images/Viewer?fileName=b10b1b56-016a-45ad-a0f0-f7c6299ed937.jpg)
Enter the first of the passcodes into the Passcodes field then click Log In to finish authenticating.
![1. Enter the first passcode, 2. Click the Remember me for 7 days checkbox (recommended), 3. Click Log In.](https://service.uoregon.edu/TDPortal/Images/Viewer?fileName=962b3c91-3799-4151-bd27-48b7bb4f52ec.png)
- Enter the first passcode that you received in the text message
- Click the Remember me for 7 days checkbox (recommended)
- Click Log In.
If you need to re-authenticate within the 30-minute timeframe, you can use the next passcode from your text message. Otherwise, you can repeat this process to get new passcodes.