Davidson College Security Duo Two-Factor Authentication Authenticate using a Duo token Updated January 24, 2020 17:31 LABELS: two-factor authentication two-factor 2FA multifactor Duo Security Supported Browsers: Chrome, Firefox, Safari, and Internet Explorer 8 or later. Visit the site protected by Duo. Click the Device: dropdown to choose your preferred authentication device. You can choose to remember your device for up to 12 hours. Choose Enter a Passcode Click the green button on your Duo token. It will generate a one-time passcode. Enter the passcode into the Duo portal. Comments 0 comments Article is closed for comments.