Incorrect canonical implementation: Make sure that the canonical URL is suitable and will not conflict with hreflang directives. Test your Nginx configuration for syntax faults using the command ‘nginx -t‘. If almost everything is okay, you’ll see a information declaring ‘configuration file /etcetera/nginx/nginx.conf check is effective’. As you could see https://listfav.com/story18883520/getting-my-prestashop-google-tag-manager-to-work