Missing Aggregate rating

Hello,

Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.

You mentioned you’re using the Rank Math PRO, but the account you have used to open this ticket is the Rank Math free version.

Can you please search and forward a receipt from FastSpring.com so we can locate your account and verify it?

Meanwhile, you can use this filter to pass the data from the Rate My Post plugin (Product Schema):

add_filter( 'rank_math/snippet/rich_snippet_product_entity', function( $entity ) {
    $entity['aggregateRating'] = [
	'@type'       => 'AggregateRating',
	'ratingValue' => rmp_get_avg_rating(),
	'bestRating'  => '5',
	'worstRating' => '1',
	'ratingCount' => rmp_get_vote_count(),
    ];
    return $entity;
});

The filter should be added to your active theme’s functions.php file (last line).

Here’s another way to apply the filter using the rankmath.php file:
https://rankmath.com/kb/filters-hooks-api-developer/#adding-filters-and-hooks-in-rank-math-php

Let us know how this goes.

Thank you.