Failed to execute 'postMessage' on 'DOMWindow'

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Hi Simon, I originally had the issue of not having the username for topic creation correct within the Discourse admin panel. But I fixed it to show JosephPaul within the panel as well as within:
<meta name='discourse-username' content='JosephPaul'>

So those are correct to my knowledge.

I also had a look at the second link you sent, and I believe everything is correct. I just tried switching my Discourse site to not require sign-in and that did not solve the issue.

The issue persists even with newly generated posts.

Edit:
I have attempted again to follow some of the suggested embed URL changes in the above post. The following code is recreating the error:

<script type="text/javascript">

setTimeout(5000)
  DiscourseEmbed = {
    discourseUrl: 'https://forum.josephpaul.com/',
    discourseEmbedUrl: 'https://josephpaul.com{{page.url}}' };

  (function() {
    var d = document.createElement('script'); d.type = 'text/javascript'; d.async = true;
    d.src = DiscourseEmbed.discourseUrl + 'javascripts/embed.js';
    (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(d);
  })();
</script>

Additional troubleshooting attempt following Simon’s thread:

I have set the embed URL to also include www. as a user suggested. The following error now occurs:

Referer:`https://josephpaul.com/test-post/`

The referer was either not sent, or did not match any of the following hosts:

josephpaul.com