Set up a Geolocation triggered pop-up on Shopify

I'm trying to create a pop-up that is going to be triggered to any user that is coming from outside the US. I've created a pop-up with the custom trigger and also the code to be added on the theme.liquid just before the </body> . However I can't make it work, any ideas?

 

<script type="text/javascript">
  function getGeolocation(callback) {
    const userCountryCode = 'US';
    callback(userCountryCode);
  }
  function openPopUpBasedOnGeolocation(userCountryCode) {
  
    if (userCountryCode !== 'US') {
   
      window._klOnsite = window._klOnsite || [];
      window._klOnsite.push(['openForm', 'FORM_ID']);
    }
  }

 openPopUpBasedOnGeolocation
  getGeolocation(function (userCountryCode) {
    openPopUpBasedOnGeolocation(userCountryCode);
  });
</script>