Posts 2 Posts within a loop

Hi there, I’m running a loop to display classes, using the post type ‘class’ is it possible within this query to then add run the posts 2 posts connected type ‘Class – Teacher’ within this? when I add the following code, it doesn’t output despite there being connections.

<?php query_posts('post_type=class&showposts=-1&orderby=title&order=asc'); ?>
<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>

<?php the_title(); ?>

<?php
$connected = new WP_Query( array(
'connected_type' => 'Class - Teacher',
'connected_items' => get_queried_object(),
) );
if ( $connected->have_posts() ) : ?>
?>
<?php while ( $connected->have_posts() ) : $connected->the_post(); ?>
<?php the_title(); ?>
<?php endwhile; ?>
<?php
wp_reset_postdata();
endif;
?>

<?php endwhile; ?>
<?php else : ?>
<?php endif; ?>

The basic idea is to list night classes, along with the teachers who will run the class, just not sure where to go from here. Help much appreciated, thanks

https://www.ads-software.com/plugins/posts-to-posts/