ScoreCam streams to one destination at a time. To reach multiple platforms simultaneously, use a restreaming service as the single destination and let it fan out to multiple platforms:

1. Create an account at Restream or Castr (both offer free tiers — check their websites for current pricing).
2. In their dashboard, connect the platforms you want to stream to (YouTube, Twitch, Facebook, etc.).
3. Get the RTMP URL and stream key from Restream or Castr.
4. In ScoreCam: Settings → Live Streaming → Add Account → Other Service → enter the credentials.

ScoreCam sends one stream to Restream/Castr, which then relays it to all your connected platforms at once.