No youtube playlist videos to be found - maybe API key not set ? This is the feed - https://www.googleapis.com/youtube/v3/playlistItems?part=snippet&type=video&videoEmbeddable=true&playlistId=PL6307A156E37CE675&key=AIzaSyDF2L7Y2AXN6nMLbt8KucLSYa6bpZ2RDPY&maxResults=10

Requests from referer are blocked.