direct_conversation_participant_authority_denied· reason_code· applies to event_envelope, auth_decision, service_callThe current governance Station's active ak.authority.direct_conversation_participant.v1 evaluator rejected an Event-mapped allowlisted action because it could not establish every required immutable binding, exact participant, active membership, Realm/Strand/current scope-derived MLS group-and-epoch cross-binding, lifecycle, resource, directional Contact, device, or Agent input. The ak.self.events.command.submit.v1 rejection exposes only this non-enumerating reason and writes nothing. Encrypted Signal product actions use their own outer admission carrier and recipient policy, never this Event reason. Consent, created_by, a local projection row, Realm owner aggregation, or an arbitrary Event/current result cannot substitute; see contract-registry.json operation_registry.direct_conversation_admission_mappings.