A service provider (SP) affiliation is a SAML 2.0 specification that permits a group of service providers to make use of the same persistent name identifier for account linking.
SP affiliations are useful when multiple SPs share a business relationship in which users need services from each affiliated provider. By agreement among the affiliation members, the same pseudonym can be used to populate the SAML_SUBJECT of assertions sent to all of the SP partners contained in this affiliation.
Each connection in the affiliation must be configured to use the same identity provider adapter instance for generating account links. For more information, see Managing authentication source mappings.