UserInfo without user authorization [HELIX / PHP]

API
3

I got the a token but I still got the same error message.

Generate Token:

    public function createAppAccessToken($type = 'client_credentials'){
      // requet endpoint
      $endpoint = self::TWITCH_ID_DOMAIN . 'oauth2/token';

      $apiParams = array( // params for our api call
        'endpoint' => $endpoint,
        'type' => 'POST',
        'url_params' => array(
          'client_id' => $this->_clientId,
          'client_secret' => $this->_clientSecret,
           'scope' => 'channel:read:editors channel:read:stream_key user:edit:broadcast user:read:email user:read:subscriptions chat:read channel:read:subscriptions',
          'grant_type' => $type ,
        )
      );
      return $this->makeApiCall( $apiParams );
    }

Get User:

      function getUserId($users, $id){
        if($users == null){
          $endpoint = self::TWITCH_API_DOMAIN. "users?id=".$id;
        }else{
          $endpoint = self::TWITCH_API_DOMAIN. "users?login=".$users;
        }

        $header = array( // temp hardcoded header
          'Client-Id: ' . $this->_clientId,
          'Authorization: Bearer '. $this->_accessToken,
        );

        $apiParams = array(
          'endpoint' => $endpoint,
          'type' => 'GET',
          'Authorization' => $header,
          'url_params' => array()
        );
        return $this->makeApiCall($apiParams);
      }

getUserId function worked with kraken and now I added the header for the Helix api but it doesnt work.
I just need the userinfo without the mail