Hi @eyetokmin, it appears the URL you have set for twitter:player:stream is a video player. If you use that property, it should be a URL to a video file, like an mp4. If you want to use your player, remove twitter:player:stream and twitter:player:stream:content_type and the Card will just load the twitter:player URL.
Make sure you test the twitter:player URL content across various iOS and Android devices.