Clicking the "SSO Login" button at ipam.illinois.edu currently results in a connection timeout. Technology Services has opened a support case with the vendor.
Meanwhile, IT Pros can log in to IPAM using your full Active Directory userPrincipalName (typically email@example.com) and the regular "Login" button.
IPAM is not able to prompt you for a second factor, but you can append a passcode or factor name to your password as documented in https://guide.duo.com/append-mode (if you don't append anything, you should automatically receive a push or phone callback depending on your Duo settings).
Please see https://wiki.illinois.edu/wiki/display/ipamdocs/Known+Issues (under Authentication) to understand a possible source of confusion with regard to GUI personalizations.