Hi Sriram, Looks like you are using SET operator to remove campaign audience which causing the SET_OPERATION_NOT_PERMITTED <https://developers.google.com/adwords/api/docs/reference/v201802/AdGroupService.OperationAccessDenied.Reason>. You could use REMOVE operator with CampaignCriterionService.mutate() <https://developers.google.com/adwords/api/docs/reference/v201710/CampaignCriterionService#mutate> service. Please retry the API operation and let me know if you are still facing an issue?
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