Change Campaign Status [OperatorError.OPERATOR_NOT_SUPPORTED @ operations[0]

[testmccdpm3]

Hi,

Im trying to change Campaignstatus.
But i always get the Error:

[OperatorError.OPERATOR_NOT_SUPPORTED @ operations[0]]

This is how I do it:
Does someone know what I am doing wrong here?

            var client = new CampaignService.CampaignService();

            
            //create Campaign with Status
            Campaign campaign = new Campaign();
            campaign.id = CurrentCampaignId;

            switch (index)
            {
                case 0:
                    campaign.status=CampaignStatus.ENABLED;
                    break;
                case 1:
                    campaign.status=CampaignStatus.PAUSED;
                    break;
                case 2:
                    campaign.status=CampaignStatus.REMOVED;
                    break;
            }

            //Create the Operation
            CampaignOperation operation = new CampaignOperation();
            operation.operand = campaign;
            operation.operatorSpecified = true;
            operation.@operator= Operator.REMOVE;
            
           
            try
            {
                client.PreAuthenticate = true;
                client.UseDefaultCredentials = true;
                client.RequestHeader = new SoapHeader
                {
                    clientCustomerId = clientCustomerId,
                    developerToken = "XXXXXXXXXXXXXXXXXXXXX",
                    partialFailure = false,
                    userAgent = "AdWordsChangeStatus",
                    validateOnly = false,
                };
                client.PreAuthenticate = true;

                CampaignReturnValue returnValue = client.mutate(new 
CampaignOperation[] {operation});

                if (returnValue != null && returnValue.value != null && 
returnValue.value.Length > 0)
                {
                    Campaign changedCampaign = returnValue.value[0];
                }
                else
                {
                    Console.WriteLine("No status has changed");
                }

            }
            catch (Exception ex)
            {
                throw new System.ApplicationException("Failed to change 
status", ex);
            }   


Thank you very much

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