Most likely you have selected the Restricted option for Responder view allowing only specific people to access the form (see screenshot below). You must always set it to "Anyone with the link" to use the google form with Formfacade. Open your form in google forms > click Published > Published options popup will be displayed > click Manage for the Responders option > select "Anyone with the link" for the Responder view > click Done > click Save. Once the permissions are updated, click on the addon icon > click Formfacade > click More options > click Update or Customize to sync the changes with Formfacade.