8. When a service provider permits or requires individual user registration, they will require the identity provider to present eduPersonTargetedID or eduPersonPrincipalName. This allows logins to be related back to the user's registration details.
NB: in general we recommend the use of eduPersonTargetedID as presentation of eduPersonPrincipalName has implications under the DPA. Configuration of eduPersonTargetedID is described in note 2 above.