contact_note_not_found
No note of that id belongs to that contact in this tenant. Scoped to the contact, not just the note: a note id that exists under a different contact is a miss here, so the pair in the path is the identity.
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/contact_note_not_found",
"title": "…",
"status": 404,
"detail": "…",
"instance": "/v1/…"
}