This is a question for the Playable Preview Tool - ask the FB support. Because even on a simple test html like this, the above warning is still showing:
<html>
<body>
<button onclick="FbPlayableAd.onCTAClick();">Click Me</button>
</body>
</html>
Plus, it’s better to an ad campaign in the FB ad cabinet and check if playable ad works there. Everything should work. Also, you will be able to check your playable ad on your mobile device.