How To Add WooCommerce customer username to edit/view order admin page

Add this code to function.php, the customer username will show on your admin woocommerce customer order detail

add_action( ‘woocommerce_admin_order_data_after_billing_address’, ‘woo_display_order_username’, 10, 1 );

function woo_display_order_username( $order ){

global $post;

$customer_user = get_post_meta( $post->ID, ‘_customer_user’, true );
echo ‘

‘.__(‘Customer Username’).’: ‘ . get_user_meta( $customer_user, ‘nickname’, true ) . ‘

‘;
}