Invalid client

What it means

Authentication is missing, or the credential was rejected.

Example detail messages returned with this error:

• Missing client_id / client_secret.
• Unknown client or wrong secret.
• Client tenant not found.

What to do

Correct the client value - detail names what was wrong.

Response shape

All fremforge API errors are RFC 9457 problem+json:

{
  "type": "https://docs.frem.sh/reference/api/errors/invalid-client",
  "title": "Unauthorized",
  "status": 401,
  "detail": "..."
}

Branch on type, not on title or detail - those are human-readable and may be reworded.