The Gatto Wishlist & Loyalty app embed must be on for Loyalty and Wishlist to run on the storefront. Each theme needs its own embed.
Open the in-app helper: Theme Embed. Or follow the steps below in the Shopify theme editor.
Published guide: Activate the app embed


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You can also open Online Store → Themes → Customize → App embeds and enable the same embed.
Repeat this for every theme you publish (live and unpublished preview themes).