WordPress - Set make primary using YOAST SEO. (Set default term for the post)

set_default_custom_post_terms.php

// **** Set default terms to all Case Studies Custom Posts
function set_default_custom_post_terms( $custom_post, $taxonomy, $first_term_slug, $second_term_slug, $primary_term ) {

	$all_posts_ids = get_posts(array(
		'fields'          => 'ids',
		'posts_per_page'  => -1,
		'post_type' => $custom_post
	));

	$first_term_id = get_term_by( 'slug', $first_term_slug, $taxonomy )->term_id;
	$second_term_id = get_term_by( 'slug', $second_term_slug, $taxonomy )->term_id;

	$primary_term_id = get_term_by( 'slug', $primary_term, $taxonomy )->term_id;

	function wpseoPrimaryTerm($tax, $postID, $term){
		if ( class_exists('WPSEO_Primary_Term') ) {
		// Set primary term.
		$primaryTermObject = new WPSEO_Primary_Term($tax, $postID);
		$primaryTermObject->set_primary_term($term);
		
		// Save primary term.
		$primaryTermObjectAdmin = new WPSEO_Primary_Term_Admin();
		$primaryTermObjectAdmin->save_primary_terms($postID);

		} else {
			echo 'Class WPSEO does not exit';
		}
	}		

	foreach ($all_posts_ids as $key => $term_id) {
		wp_set_post_terms( $term_id, [$first_term_id, $second_term_id], $taxonomy );
		wpseoPrimaryTerm( $taxonomy, $term_id, $primary_term_id );	
	}

}



set_default_custom_post_terms('case-study', 'catinsight', 'resources', 'case-study', 'case-study');