Creating a twitter audio card - Unable to render Card preview


I am working on creating an audio player card but it fails to render in the card validator. I have all links https://
Do you need to be white listed before you can see the rendered card?

<!DOCTYPE html>
    <meta content="text/html; charset=UTF-8" name="Content-Type" />
	<meta name="twitter:card" content="player">
	<meta name="twitter:site" content="@99centbeats_com">
	<meta name="twitter:title" content="Instrumental Sampler">
	<meta name="twitter:description" content="This is a sample instrumental.">
	<meta name="twitter:image" content="">
	<meta name="twitter:player" content="">
	<meta name="twitter:player:width" content="480">
	<meta name="twitter:player:height" content="480">
    <meta name="twitter:player:stream" content="">
	<meta name="twitter:player:stream:content_type" content="audio/mpeg">

<!DOCTYPE html>

<audio controls>
  <source src="" type="audio/mpeg"></source>
Your browser does not support the audio element.