Relationship Admin Column not showing data

Using the below code, and column headers are created, but no data is showing in the columns.

Screenshot of column: https://cl.ly/7cbffe5d6bc1

Screenshot of relationship: https://cl.ly/ac94e6b15fa2

add_action( 'mb_relationships_init', function() {
    
    // attorneys to events
    MB_Relationships_API::register( array(
        'id'   => 'attorney_to_event',
       
        'from' => array(
            'post_type'   => 'attorney',
            'meta_box'    => array(
                'title'       => 'Linked Events',
            ),
        ),
        'to' => array(
            'post_type'   => 'event',
            
            'admin_column' => array(
                'position'   => 'after title',
                'title'      => 'Speakers',
            ),
            
            'meta_box'    => array(
                'title'       => 'Linked Attorney',
            ),
        ),
    ) );
} );