I am creating a WooCommerce order programmatically but I cannot seem to get Tax added to A custom shipping method. Here is my code:

  $shipping = new WC_Order_Item_Shipping();

                $shipping->set_props(
                    array(
                        'method_title' => "Tracked (2-3 business days)",
                        'method_id'    => "advanced_flat_rate_shipping:779",
                        'taxes'    => array(),
                        'tax'    => array(),
                        'calc_tax'  => 'per_item',
                        'total'        => 4,
                        'tax_class'    => 'standard',
                        'total_tax'    => 0.80,
                    )
                );

here is a snapshot of an order with the tax field blank – https://snipboard.io/BoWZJT.jpg