RTC_CREDENTIAL_MISSING
HTTP 401No
No vendor key/credential resolved for the RTC vendor (e.g. LiveKit api_key+secret, Agora app_id+app_certificate, Agora Customer Key/Secret for RESTful control). Honest error, NOT a fabricated success.
By default a failed call returns a result with an error instead of throwing, so your business flow is never interrupted.
Published error codes are permanent: their meaning never silently changes, and deprecated codes keep returning for at least 12 months.