If installing the SAML v2 Plug-in for Federation Services on an instance of Federation Manager, you must enable the SAML v2 authentication module using the Federation Manager console.
Log in to Federation Manager as the top-level administrator, by default, amadmin.
Select the Organization tab.
Select the Authentication tab.
Click Edit next to the Core service.
Select SAML2 in the Organization Authentication Modules attribute list and click Save.
Log out of the Federation Manager console.