Facebook ID is missing in Business Manager

Hello,

I have the following error message when i am in the facebook buisness manager.
A required field is missing: id
Products without “id” information can’t be uploaded. Please check that this field is included for each product in a separate, labeled column.

I have added the following snippet with a plugin to my functions php but it is not working.
/**
* Filter to change the Rank Math schema data for Product.
* @param array $entity
* @return array
*/
add_filter(‘rank_math/snippet/rich_snippet_product_entity’, function ($entity) {
$entity[‘@id’] = get_permalink().’#product’;
return $entity;
});

Can you please provide help.

Thank you