Add RTMP destinations to a live stream that is already running in a room. Each endpoint must be the name of an rtmp entry in the room's streaming_endpoints property; unknown names are rejected with a 400. This is the REST counterpart of daily-js addLiveStreamingEndpoints().

The update is asynchronous. A 200 means the request was accepted and forwarded to the live stream, not that it has taken effect. The streaming.updated webhook confirms the request was processed; anything the media server rejects or fails to apply later arrives as a streaming.warning webhook, or as a live-streaming-warning event in daily-js.