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&playlistId=PLtHnQTJ77XuxbfSnDT_5Z4R1YCXnNcIdK&key=AIzaSyCBboz-HDU3wi0CZVl9QxaEj2Da2pQruU0&maxResults=50