What I think is happening here is that you're mixing up the signal and the event.

Your code seems fine, it creates a broadcast, but nowhere in the code do you link it to the signal that the camera sends. So, you end up with a camera signal that goes to ingestion endpoint A, and then you've got the event (public-facing title, description, etc) which doesn't connect in any way to ingestion endpoint A (hope this makes sense).

I haven't used their API in ages, but there appears to be a bind you can use: https://developers.google.com/youtube/v3/live/docs/liveBroadcasts/bind

This is their example python code:

# -*- coding: utf-8 -*-

# Sample Python code for youtube.liveBroadcasts.bind
# See instructions for running these code samples locally:
# https://developers.google.com/explorer-help/code-samples#python

import os

import google_auth_oauthlib.flow
import googleapiclient.discovery
import googleapiclient.errors

scopes = ["https://www.googleapis.com/auth/youtube.force-ssl"]

def main():
    # Disable OAuthlib's HTTPS verification when running locally.
    # *DO NOT* leave this option enabled in production.
    os.environ["OAUTHLIB_INSECURE_TRANSPORT"] = "1"

    api_service_name = "youtube"
    api_version = "v3"
    client_secrets_file = "YOUR_CLIENT_SECRET_FILE.json"

    # Get credentials and create an API client
    flow = google_auth_oauthlib.flow.InstalledAppFlow.from_client_secrets_file(
        client_secrets_file, scopes)
    credentials = flow.run_console()
    youtube = googleapiclient.discovery.build(
        api_service_name, api_version, credentials=credentials)

    request = youtube.liveBroadcasts().bind(
        id="YOUR_BROADCAST_ID",
        part="snippet",
        streamId="YOUR_STREAM_ID"
    )
    response = request.execute()

    print(response)

if __name__ == "__main__":
    main()

So, you'll have to add this as a new function, something like:

def bind_broadcast_to_stream(youtube, broadcast_id, stream_id):
    request = youtube.liveBroadcasts().bind(
        part="id,snippet,contentDetails,status",
        id=broadcast_id,
        streamId=stream_id
    )
    response = request.execute()
    print(f"Broadcast {broadcast_id} has been bound to stream {stream_id}.")
    return responsedef bind_broadcast_to_stream(youtube, broadcast_id, stream_id):
    request = youtube.liveBroadcasts().bind(
        part="id,snippet,contentDetails,status",
        id=broadcast_id,
        streamId=stream_id
    )
    response = request.execute()
    print(f"Broadcast {broadcast_id} has been bound to stream {stream_id}.")
    return response