Any time you incorporate hreflang tags, guarantee they all issue to indexable and crawlable pages. Check out which tags are causing the issues and rectify them by making sure the pages they’re pointing to are Are living.  Canonical URLs are employed in order to avoid duplicate material and suggest to https://addons.prestashop.com/en/seo-natural-search-engine-optimization/31857-automatic-google-rich-snippets-json-ld-open-graph-seo.html