Meta Box

I have just tested with the pastebin code I shared previously disabled. The issue still persists.

The only other thing I can think of is maybe it has something to do with the way I am using the shortcode?

Here's how I'm adding the form:
[mb_user_profile_register password_strength='medium' role="pending_dealer" id="default-fields, dealership-user-details,dealer-contact-information,dealer-consent" confirmation="We have received your account information and your account is currently pending. In the meantime, you may log in to your account to modify your profile details. Once your account is approved, you will receive a message with further instructions." ]

The default-fields box is added via the pastebin code I shared earlier. The rest are added with the builder, but I just double checked and all of those are set to required within the builder.

This is what we ended up doing. Thanks! This can be closed.

This worked perfectly with some modifications for our use case. One thing to note if anyone else find this helpful is that I changed your loop from
while ( $connected->have_posts() ) : $connected->the_post();
to
if( $connected->have_posts()) : while( $connected->have_posts()) : $connected->the_post();
so that I could do an else in the event that no posts were found. Thanks for your help, you can mark this resolved!

Is the issue that I'm using a callback function in an HTML field then? We are only trying to show a list of related posts with a link to edit, however, when I use the following function as a callback, I get an empty array.

function ndig_get_accepted_offer_admin(){
	$results = array();
	global $post;
	$postID = $post->ID;
	$connected = new WP_Query( [
    'relationship' => [
        'id'   => 'listing-to-offer-relationship',
        'from' => $postID, // You can pass object ID or full object
    ],
    'nopaging'     => true,
] );
while ( $connected->have_posts() ) : $connected->the_post();
    $results[] = '<a href="'.the_permalink().'">'.the_title().'</a>';
endwhile;
	//$pretty_results = implode(" ",$results);
	return var_dump($results);
wp_reset_postdata();

}