Chat API - Pull Email

We were looking at some pages:

•  https://partners.commentsold.com/pages/brandon-test-page - Public Page

•  https://partners.commentsold.com/manage/custom_site_themes/358964/edit - Technical Edit Page (Sections → Lead Form)

•  https://developer.zendesk.com/api-reference/widget/core/?_ga=2.104367040.1581430116.1651505805-913812002.1639592014#prefill - Prefill Code Option

•  https://support.zendesk.com/hc/en-us/articles/4408832257562-Advanced-customization-of-your-Web-Widget#topic_mnz_pr2_tfb - Prefill Documentation
  
  Tried this:
  
  

  <script id="ze-snippet" src="https://static.zdassets.com/ekr/snippet.js?key=ourkeyhere"> 
   zE('webWidget', 'prefill', {
      email: {
        value: ' {{ site.current_user.email }} '',
        readOnly: true // optional
      }
    });
  </script>

• 
  However, it still does not seem to pass the email to the Chat Support agent.  Any thoughts on what we may be missing here?  Thanks!