enableTracking() doesn't work with app.mews.com

This is the related issue: 

To simplify - we have implemented this solution (in a bit more advanced way):

 <script>
  Mews.Distributor(
    { configurationIds: ['YOUR-CONFIG-ID'] },
    function (api) {
      api.enableTracking();
      api.open();
    }
  );
</script>

and we have made sure that it works.

However, when our guests is redirected to the domain app.mews.com for validating there credit card, the consent for tracking isn’t passed on. Unfortunately, when people have validated there credit card, they are not redirected back to our domain (www.nexthousecopenhagen.com) for the confirmation-page - they stay on app.mews.com where the tracking isn’t working.

Does anyone know how to fix this?