realm_state_snapshot_issuer_revoked· reason_code· applies to client_sync, realm_state_snapshot_verificationSnapshot signer's authority (Realm owner / admin / trusted snapshot issuer / witness quorum membership) was revoked before the snapshot's origin admission/issuance gate, or the verifier cannot prove the frozen authority basis. Client MUST quarantine or reject the snapshot. A revoke accepted after a valid snapshot issuance does not retroactively invalidate that snapshot.