After creating the Session, the Client reads the available UserTokenPolicies from the AuthorizationService Object if it has not previously cached the information. It then chooses one that references an Identity Provider for the user identities that it has available. The user identities may be provided out-of-band or they may be provided by an interactive user. The Client then requests an Access Token from the Identity Provider.
The Authorization Server determines if the Client is permitted to receive an Access Token based on the claims granted by the Identity Provider. The rest of the interactions are the same as described in 9.3.