Incorrect canonical implementation: Ensure that the canonical URL is correct and would not conflict with hreflang directives. Check your Nginx configuration for syntax errors using the command ‘nginx -t‘. If all the things is alright, you’ll see a information declaring ‘configuration file /etcetera/nginx/nginx.conf check is thriving’. In easy phrases, copy https://addons.prestashop.com/ru/seo-natural-search-engine-optimization/30904--hreflang-seo.html