Creating a shortcode by pulling in a custom field from a plugin

add_shortcode( 'dashtest', function () {
$user_id = get_current_user_id();

  $key = 'user_wpc';
  $single = true;
  $user_last = get_user_meta( $user_id, $key, $single ); 
    

if ($user_id == 0) {
    echo 'You are currently not logged in.';
} else {
    echo do_shortcode('[userwpcode key="'.$user_last.'/edit"]');
}
} );