Failed to execute ‘postMessage’ on ‘DOMWindow’

Builder
1

I keep receiving “Failed to execute ‘postMessage’ on ‘DOMWindow’: The target origin provided (‘https://youtube.com’) does not match the recipient window’s origin (‘https://www.youtube.com’).”

The issue is with the www. The video plays but it just keeps throwing the above error repeatedly.
I’ve tried adding “www” to the source link, but then it returns a 404 for the video. I’m still not having any luck. Any ideas?

Here are the code snippets

$(document).ready(function() {
        // Add custom contents from html file using an iframe:
        $('body').append('<div id="iframe-o" style="visibility: hidden; 
position: relative; display: table; margin: auto;"><div id="iframe-m" 
style="display: table-cell; vertical-align: middle;"><div id="iframe-i" 
style="display: inline-block; width:100%; overflow-y: auto; 
overflow-x: hidden;"><iframe id="iframe" src="'+src+'" style="width: 100%; height: 100%;">
</iframe></div></div></div>');
    

<!doctype html>

<html style="width: 100%; height: 100%;">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="user-scalable=no">
    <script src="https://youtube.com/player_api"></script>
  <style>
    .player {
    pointer-events: none;
    position: absolute;
            }
  </style>
  <script>
    </script>
</head>
  <body style="width: 95vw; height: 95vh; position: relative;">
    <iframe class="ytplayer" id="player" style="width: 60%; 
height: 60%; display: block; position: absolute; top: 60%; 
left: 60%; transform: translate(-50%, -50%);" 
src="https://youtube.com/embed/UZ3oEn5Q7U4?&amp;
cc_load_policy=3&amp;autoplay=1&amp;start=0&amp;
fs=0&amp;controls=1&amp;modestbranding=1&amp;
disablekb=0&amp;loop=1&amp;enablejsapi=1"></iframe>
    <script type="text/javascript">
      var player;
      function onYouTubeIframeAPIReady() {
        player = new YT.Player('player', {
          videoId: 'kpCJyQ2usJ4',
          events: {
            'onStateChange': function(e){
              if(e.data == 0){
                parent.$(window.top).data('continueRoutine', false);
              }
            }
          }
        });
      }
    </script>
  </body>
</html>

Any help would be appreciated.

2

This was not the case about 5 months ago. So, I do not know if this is a result of a recent update in the site’s infrastructure or what.