Init hook function to call other hook in function.php

I am trying to add a function in the init hook that will call another hook like this but the function createNewPost is not being executed why ? :

add_action( 'init', 'loadAfterUserRegistrationHook' );
    function loadAfterUserRegistrationHook(){
    add_action( 'user_meta_after_user_register', 'createNewPost' );
}    

function createNewPost( $response ){
global $userMeta;

$userID = $response->ID;
$user = new WP_User( $userID );

$role = $userMeta->getUserRole();

if( $role = 'artiste' ){ 

    $newPost = array(
      'post_title'    => $user->nickname,
      'post_content'  => $user->description,
      'post_status'   => 'pending',
      'post_author'   => $userID,
      'post_type'     => 'cpt_artists'
    );

    $post_id = wp_insert_post( $newPost );
    error_log('Post ID : '.$post_id);

    wp_set_object_terms( $post_id, array('dj'), 'artist-category');

   }
 }