Take note that If the shop has presently been indexed by Google or another search engine, it might just take a while on your variations to look during the search engine results... You may have to be patient! More often than not, we advocate not to the touch these fields https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-hreflang-tags-canonical-tags-on-all-pages.html