Integración Formulario Hubspot con Google Ads Wordpress

Necesito trackear formularios de Hubspot en submit con Google Ads:

tengo este evento:
<!-- Event snippet for Formulario Brochure conversion page
In your html page, add the snippet and call gtag_report_conversion when someone clicks on the chosen link or button. -->
<Script>
function gtag_report_conversion(url) {
  var callback = function () {
    if (typeof(url) != 'undefined') {
      window.location = url;
    }
  };
  gtag('event', 'conversion', {
      'send_to': 'AW-449311014/imEKCKXZ94kCEKbin9YB',
      'event_callback': callback
  });
  return false;
}
</script>

y lo estoy tratando de trackear en submit así:

<script charset="utf-8" type="text/javascript" src="//js.hsforms.net/forms/shell.js"></script>
<script>
  hbspt.forms.create({
    region: "na1",
    portalId: "7577202",
    formId: "54db8cbf-dfdd-4089-bd0c-e28657ed85db",
    onFormSubmit: function($form) {
      return gtag_report_conversion("#");
    alert('se envio');     
    }
});
</script>
<!-- Global site tag (gtag.js) - Google Ads: 449311014 -->
<script async src="https://www.googletagmanager.com/gtag/js?id=AW-449311014"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());

  gtag('config', 'AW-449311014');
</script>
<!-- Event snippet for Formulario Brochure conversion page
In your html page, add the snippet and call gtag_report_conversion when someone clicks on the chosen link or button. -->
<Script>
function gtag_report_conversion(url) {
  var callback = function () {
    if (typeof(url) != 'undefined') {
      window.l
ocation = url;
    }
  };
  gtag('event', 'conversion', {
      'send_to': 'AW-449311014/imEKCKXZ94kCEKbin9YB',
      'event_callback': callback
  });
  return false;
}
</script>

El problema es que no llega la conversión a Google Ads