GTIN Error Google Search Console

Hello,

Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.

Adding GTIN, ISBN & MPN is a feature of the Rank Math PRO plugin.

If you want to add GTIN, ISBN, or MPN to your WooCommerce products using the free version of Rank Math plugin, then you’ll have to modify and use the following filter:

add_filter( 'rank_math/snippet/rich_snippet_product_entity', function( $entity ) {
    $entity['gtin'] = 'your_gtin_number';
    return $entity;
});

Here’s how you can add filter/hook to your WordPress site: https://rankmath.com/kb/wordpress-hooks-actions-filters/

Hope that helps and please don’t hesitate to let us know if you have any other questions.
 
Thank you.