port_in_refused
HTTP 422§9.17 The customer team workspace on the phone (`/v1/mobile/workspace/*`, `/v1/mobile/voice/token`)
Twilio refused the port-in request with the reason in detail; the request is back to draft (port_in).
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/port_in_refused",
"title": "…",
"status": 422,
"detail": "…",
"instance": "/v1/…"
}