a2p_registration_missing

HTTP 409§9.8 Messaging, calendar, and webhooks

A2P 10DLC registration is incomplete on the sending number's TelephonyAccount. Weeks of lead time, surfaced at onboarding rather than discovered here (01-roadmap.md).

Problem shape

Every non-2xx response is an RFC 9457 application/problem+json body. The type URI below is stable and machine-matchable, so branch on the final path segment (the code) and treat the status as redundant confirmation. See the error-handling guide.

{
  "type": "https://docs.vocapable.com/errors/a2p_registration_missing",
  "title": "…",
  "status": 409,
  "detail": "…",
  "instance": "/v1/…"
}

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