Add Youtube Channel to Excuded Placements

[Robert]

Hi,

is it possible to add a youtube channel to the exclueded placements on 
campaign level?

I tried with this code and php api, but received an error. 

My code is adopted to an example 
from https://developers.google.com/adwords/api/docs/samples/php/targeting

function addnegativeplacement($adWordsServices, $session, 
$campaignId,$channelid) {

    $campaignCriterionService = $adWordsServices->get($session, 
CampaignCriterionService::class);


    $campaignCriteria = [];
    $operations = [];
    foreach ($campaignCriteria as $campaignCriterion) {
      $operation = new CampaignCriterionOperation($session);
      $operation->setOperator(Operator::ADD);
      $operation->setOperand($campaignCriterion);
      $operations[] = $operation;
    }


    // Add a negative campaign criterion.
    $negativePlacement = new YouTubeChannel($session);
    $negativePlacement->setchannelId("$channelid");
    
//$negativePlacement->setCriterionType(PlacementMatchType::YOUTUBE_CHANNEL);
    $negativeCriterion = new NegativeCampaignCriterion();
    $negativeCriterion->setCampaignId($campaignId);
    $negativeCriterion->setCriterion($negativePlacement);


    $operation = new CampaignCriterionOperation();
    $operation->setOperator(Operator::ADD);
    $operation->setOperand($negativeCriterion);
    $operations[] = $operation;


    $result = $campaignCriterionService->mutate($operations);


    // Print out some information about added campaign criteria.
    foreach ($result->getValue() as $campaignCriterion) {
      printf(
          "%s with ID %d and type '%s' was added as negative placement.\n",
          $placementdomain,
          $campaignCriterion->getCriterion()->getId(),
          $campaignCriterion->getCriterion()->getType());
    }
}

 addnegativeplacement(new 
AdWordsServices(),$session,$campaignId,$channelid);


I receive the following error:

PHP Fatal error:  Uncaught exception 
'Google\AdsApi\AdWords\v201809\cm\ApiException' with message 
'[OperationAccessDenied.MUTATE_ACTION_NOT_PERMITTED_FOR_CLIENT @ 
operations[0]]'

Can you help me with this please?

Best,
Robert

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