Order terms by term_order

Context

• Post Type: Resources
• Taxonomy: Media Type, Term: Audio
• Taxonomy: Series

The following code displays a unique list of the custom taxonomy “Series”

I want to order the list by term_order, but it is not working. Any suggestions?

The site. Currently it’s ordered by ID

    <?php
                $post_data = array();

                $my_query = new WP_Query( array( 
                        'post_type' => 'resource',
                        'posts_per_page' => -1,
                        'media_type' => 'audio'

                    ) 
                );

                if ( $my_query->have_posts() ) {
                    while ( $my_query->have_posts() ) {
                        $my_query->the_post();
                        $post_data[] = get_the_ID();
                    }
                }

// Start with whatever ID you want to have from Media Type
                $audio = 16;

                // Get all those post_ids for that term
                $post_ids = get_objects_in_term( $audio, 'media_type', array('post_status' => 'publish') );

                // Then get the series terms for those post ids
                $terms = wp_get_object_terms( $post_data, 'series', array('fields' => 'ids', 'orderby' => 'menu_order' ) );
                $result = array_values( array_unique($terms) );

                ?>


            <?php
        $a = $result;

        foreach ($a as $v) {
        $term = get_term( $v, 'series' );
        $name = $term->name;
        $slug = $term->slug;
        echo '<div class="resource-item"><a href="'.get_term_link($slug, 'series').'" title="'.$name.'"><div class="play"></div><li>'.$name.'</li></a></div>';      
        } 

        ?>