Movement Challenge

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=nBKWgHpmXCnkv2XyWc23ingoQymzzjvN&key=AIzaSyDkl85dlsoikYu5eln9HPaXQZJDlghNavs&maxResults=50
The playlist identified with the requests playlistId parameter cannot be found.