If your product schema is returning errors you’re gonna really have to get a bit more forensic to figure out why. Allow us to edit an current Schema template and see every one of the options that we see. We're going to try this by clicking the Edit website link https://www.presta-addons-modules.com/en/opencart-seo-automatic-google-rich-snippets-json-ld-integration-opengraph-twitter-tags-schemaorg.html