Every time The shopper login to The shop it is seen during the tag manager. The client individual specifics which include title and e mail id are displayed in the data layer. Check your Nginx configuration for syntax mistakes using the command ‘nginx -t‘. If everything is ok, you’ll see https://addons.prestashop.com/it/seo-indicizzazione-naturale/30904-tag-hreflang-automatici-e-tag-canonici-seo.html