To sign in using ADFS, your RPI server must have been configured to support this feature.
In addition, an ADFS user with an email address matching the RPI user as which you intend to sign in must exist and must have been granted appropriate privileges to access RPI.
To sign in using ADFS, select this option at the Sign in using chooser. When you do so, Username, Password, Forgot password? and Save credentials… are hidden.
If you are already signed in using Active Directory, and the credentials are valid in ADFS, you do not need to provide further credentials to sign into RPI.
If you are not yet authenticated, on clicking Sign in, an empty dialog is displayed, over which a Windows Security dialog is shown. Enter your credentials and click OK. Upon successful authentication of the supplied credentials, the dialogs are removed from display and, after a short delay, the RPI Sign in dialog is replaced with the Home Page (if you are able to access multiple RPI clients, you will first be asked to select one).