How to add post category (taxonomy) in wp_insert_post

Hi,

I can’t add a category when i create a new post (in development).

I use template with custom post named “artist” and use taxonomy “artist category” and i use this code for add a new post :

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

But it’s not working … ??

Do you have an idea ? Thanks

[ Please do not bump, that’s not permitted here. ]