403- request has insufficient authentication scopes

I want to link and view the analytics account linked with Google Adwords.

Procedure used:

1. Authenticating google account with scopes "Ananlytics and Adwords" with following url https://www.googleapis.com/auth/adwords https://www.googleapis.com/auth/analytics
2. After getting the authentication response creating Google analytics service object.
3. Google ads link API throwing error "Insufficient Premissions" screenshot attached

Script :

<?php //function to authenticate google account and create analytics service object function googleAuth(){         if (!empty($code)) {                         $postFields = 'client_id=' . Configure::read('GOOGLE_OAUTH_CLIENT_ID') . '&client_secret=' . Configure::read('GOOGLE_OAUTH_CLIENT_SECRET') . '&code=' . $code . '&grant_type=authorization_code&redirect_uri=' . Configure::read('GOOGLE_OAUTH_REDIRECT_URI');                         $ch = curl_init();                         curl_setopt($ch, CURLOPT_URL, 'https://accounts.google.com/o/oauth2/token');                         curl_setopt($ch, CURLOPT_POSTFIELDS, $postFields);                         curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);                         curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);                         curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);                         $Rec_Data = curl_exec($ch);                         if (curl_exec($ch) === false) {                                 return $Rec_Data;                         }                         $Rec_Data = json_decode($Rec_Data, true);                         if (isset($Rec_Data['refresh_token'])) {                                                                  try {                                         $credentials = array('client_id' => Configure::read('GOOGLE_OAUTH_CLIENT_ID'), 'client_secret' => Configure::read('GOOGLE_OAUTH_CLIENT_SECRET'), 'redirect_uris' => array(Configure::read('GOOGLE_OAUTH_REDIRECT_URI')));                                         $client = new \Google_Client($credentials);                                                                                                  $client->addScope(\Google_Service_Analytics::ANALYTICS_READONLY);                                                 $client->setAccessToken($Rec_Data['access_token']);                                                 // Create an authorized analytics service object.                                                 $analytics = new \Google_Service_Analytics($client);                                                                          } catch (Exception $e) {                                         echo 'Caught exception: ', $e->getMessage(), "\n";                                         die();                                                                          }                         }                 } else {                         if (!empty($id)) {                                 header("Location:https://accounts.google.com/o/oauth2/auth?response_type=code&client_id=" . Configure::read('GOOGLE_OAUTH_CLIENT_ID') . "&redirect_uri=" . Configure::read('GOOGLE_OAUTH_REDIRECT_URI') . "&access_type=offline&approval_prompt=force&state=" . $id . "&scope=https://www.googleapis.com/auth/adwords https://www.googleapis.com/auth/analytics");                                 exit;                         }                 } } //function to fetch linked account list function adwordsLinkAnalytics($analyticsAuth){                 $this->autoRender = false;                          try {                         $adWordsLinks = $analyticsAuth->management_webPropertyAdWordsLinks                                 ->listManagementwebPropertyAdWordsLinks('123456', 'UA-123456-1');                 } catch (apiServiceException $e) {                         print 'There was an Analytics API service error '                         . $e->getCode() . ':+' . $e->getMessage();                         exit;                 } catch (apiException $e) {                         print 'There was a general API error '                         . $e->getCode() . ':-' . $e->getMessage();                         exit;                 }                 pr($adWordsLinks);                 exit;                  } 

Required result: List of the analytics account linked with adwords account.