transcription_stream_refused
HTTP 403§9.17 The customer team workspace on the phone (`/v1/mobile/workspace/*`, `/v1/mobile/voice/token`)
/internal/workspace-transcription/*: the fork is unknown, closed, or its one-time credential does not match (deliberately indistinguishable).
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/transcription_stream_refused",
"title": "…",
"status": 403,
"detail": "…",
"instance": "/v1/…"
}