Tag not firing on Pardot form in iFrame

Question

I'm trying to set up conversion tracking for Pardot forms set up in iFrames. I've added the HTML code to the forms thank you page and set up 2 tags in Google Tag Manager. It looks like my second tag is not firing and I'm not sure why. I will post code and steps I've taken so far.

Thank you page code:

     <script>

    try {

 parent.postMessage(‘iframeTestPageLoad’, ‘https://www.websitename.com‘);

} catch(e) {

 // Something went wrong…

 window.console && window.console.log(e);

}

   </script>

Listener Tag 1 in Google Tag Manager:

• tag with custom HTML

• trigger fires on all pages

  window.addEventListener(‘message’,function(){ if (event.origin === “https://go.pardot.com“ && event.data === ‘iframeTestPageLoad’) { window.dataLayer.push({‘event’: ‘formSubmit’}); } else { console.log(‘the tag did not work’) } }, false)

Tag 2 to send info to GA:

• track type is Event
• custom event trigger named 'formSubmit'

When testing in preview mode and submitting form Tag 1 is being fired but not Tag 2. When running this with Dev tool I see the following errors: "Failed to load resource: net::ERR_NAME_NOT_RESOLVED" associated with website in iFrame code. When I click "view frame source" on form I can find this website used in code....

<link rel="stylesheet" href="https://xxxxxxxx.azurewebsites.net/Static/_fonts.css">

Any help on this would be much appriciated!