This means that you may have unparsable structured knowledge problem, and parsers can not read through schema markup, so make positive your schema markup syntax is suitable, here are some measures to check when troubleshooting: Google defines rich snippets as “an enhanced look for end result with added visual or https://addons.prestashop.com/en/seo-natural-search-engine-optimization/31857-automatic-google-rich-snippets-json-ld-open-graph-seo.html