Eloqua Webforms - GUID not passed; no Eloqua page visit recorded

Problem/Motivation

The Eloqua integration works and data is passed from Drupal webform to Eloqua form. Although all the Eloqua tracking scripts are in place, when a new visitor submits the webform, the page visit is not tracked in Eloqua. This is done via GUID.
We have also added the GUID function to retrieve and map the value to a hidden field; since the submission is done via API, the GUID might not be passed correctly. Is there a workaround for this?

Drupal.behaviors.eloquaApiForm = {
  attach: function(context) {
    var elqCustomerLoaded = setInterval(function () {
      if (typeof GetElqCustomerGUID !== 'function') {
        var elqLoaded = setInterval(function() {
          if (typeof _elqQ !== 'undefined') {
            _elqQ.push(['elqGetCustomerGUID']);
            clearInterval(elqLoaded);
          }
        }, 500);
      }
      else {
        document.querySelector("input[name='elqcustomerguid']").value = GetElqCustomerGUID();
        clearInterval(elqCustomerLoaded);
      }
    }, 500);
  }
};

Steps to reproduce

Use a clean browser and submit the form; the submission will be recorded in Eloqua as a form submission, but the page hosting the form will not be recorded as a page visit.
As if the visitor GUID is not being passed to be mapped to newly created contact.