Woocommerce- Show upsells in order received page [on hold]

I am trying to show the upsell products in the order received page. (thank you page after the order is placed)

I have managed to get the product id on that page, however i am unable to get the upsell ids from that product id.

Here is what I tried to use.

$items = $order->get_items();

    foreach ( $items as $item ) {
        $product_id = $item['product_id'];
    }

    echo $product_id;

    $product = new WC_Product($product_id);
    $upsells = $product->get_upsells();
    if (!$upsells)
        return;

    $meta_query = WC()->query->get_meta_query();

    $args = array(
        'post_type' => 'product',
        'ignore_sticky_posts' => 1,
        'no_found_rows' => 1,
        'posts_per_page' => $posts_per_page,
        'orderby' => $orderby,
        'post__in' => $upsells,
        'post__not_in' => array($product->id),
        'meta_query' => $meta_query
    );

    $products = new WP_Query($args);
    if ( $products->have_posts() ) : ?>

        <div class="upsells products">

            <h2><?php _e( 'You may also like&hellip;', 'woocommerce' ) ?></h2>

            <?php woocommerce_product_loop_start(); ?>

                <?php while ( $products->have_posts() ) : $products->the_post(); ?>

                    <?php wc_get_template_part( 'content', 'product' ); ?>

                <?php endwhile; // end of the loop. ?>

            <?php woocommerce_product_loop_end(); ?>

        </div>

    <?php endif; ?>

There is always only ONE product in the cart and not many products.

The above loop doesn't display anything at all. WP_Debug is true, still no error !

Any help is appreciated.