Relationship WP_Query for Oxygen Builder [Repeater] component

I created a relationship between post to expert (post cpt). Author will create a expert that will link/relate to a post.

I'm trying to display the linked/related posts on the author archive page.

Im using the tutorial from metabox doc but getting a Invalid argument supplied for foreach() error.

sample

<?php

$auid = get_the_author_meta( 'ID' );

$args = array(
    'author' => '$auid',
    'post_type' => 'post'
    );

$my_query = new WP_Query( $args );

MB_Relationships_API::each_connected( [
    'id'   => 'expert-challenge',
    'to' => $my_query->posts, // Set to $my_query.
] );

while ( $my_query->have_posts() ) : $my_query->the_post();

    // Display connected pages
    foreach ( $post->connected as $p ) :
      echo $p->post_title;

        // More code here.
    endforeach;

      echo '<pre>'; var_dump($my_query->posts) ; echo '</pre>';
      
endwhile;
//wp_reset_postdata();