Is it possible to generate NPIV WWNs to VM using Orchestrator

Hi,

I am trying to assign NPIV WWN to VM by using the following code in the script block of my workflow.

But I keep getting invalid configuration error in the VC client.

What am I missing?

            var vmConfigSpec = new VcVirtualMachineConfigSpec() ;
            vmConfigSpec.npivWorldWideNameOp = VcVirtualMachineConfigSpecNpivWwnOp._generate ;
            vmConfigSpec.npivTemporaryDisabled = false;
            vmConfigSpec.npivWorldWideNameType = VcVirtualMachineConfigInfoNpivWwnType._vc;
            vmConfigSpec.npivDesiredNodeWwns = 1;
            vmConfigSpec.npivDesiredPortWwns = 1;

            vm.reconfigVM_Task(vmConfigSpec);

Thanks,

Tej