Important: If you have not enrolled your YubiKey in Duo yet, please follow these instructions first:

Authenticating with your YubiKey

The next time you log in to Single Sign-On (SSO) application like Canvas or EagleNET, you can simply press/touch your YubiKey's gold-colored contact to log in when prompted to "Use your Security Key to log in". The experience shown below is in Chrome (recommended). 

In some browsers, you may need to select your security key from the drop-down list of your authentication devices.

Once you select your YubiKey from the list, click Use Security Key and tap your security key when prompted.