Only canonical URLs really should be listed with your sitemap, Though Google says that doing so is often a weak canonicalization sign. Overview the groups of duplicates. Decide one particular canonical version that should be indexed inside the search results. Specify this as the canonical Model throughout all duplicates (and https://addons.prestashop.com/it/seo-indicizzazione-naturale/31857-google-rich-snippet-automatico-json-ld-open-graph-seo.html