Hi, Could you provide the error that you encounter when you perform this operation? Using the above program, you'll encounter the CampaignCriterionError.CONCRETE_TYPE_REQUIRED <https://developers.google.com/adwords/api/docs/reference/v201609/CampaignCriterionService.CampaignCriterionError>. You need to create a concrete criterion of type IpBlock <https://developers.google.com/adwords/api/docs/reference/v201609/CampaignCriterionService.IpBlock> and then provide this to NegativeCampaignCriterion <https://developers.google.com/adwords/api/docs/reference/v201609/CampaignCriterionService.NegativeCampaignCriterion>. This example <https://github.com/googleads/googleads-php-lib/blob/master/examples/AdWords/v201609/Targeting/AddCampaignTargetingCriteria.php#L131> shows how to add a negative keyword criterion at the campaign level. You need to add the negative IpBlock criterion in a similar fashion. Could you try this out and let me know if it works?
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