profile_unavailable· reason_code· applies to service_callPer-actor outcome of ak.self.actor_profile.read.resolve.v1. Unknown actor, actor without an accepted global profile, actor that is not an effective joined member of the request realm_id, and a caller not authorized for that actor MUST all report this single value, so the only outward carrier for PCR-resident ak.profile.create / ak.profile.update cannot be used to probe membership or account existence. See zh/discovery/profiles-presence.md §2.3.