Shopify Schema Markup for Reviews Widget is often pretty tough (as it depends upon the evaluation apps that you're using), I recommend you leave it on the experts.  Please check the demo occasion down below, where the module is installed and configured in debug mode. It is working wonderful around https://www.presta-addons-modules.com/en/front-office/prestashop-tawkto-multilingual-live-chat-support.html