Set-VmNetworkAdapterIsolation One or more arguments are invalid (0x80070057)

Hello, not sure what am I missing? 

Set-VmNetworkAdapterIsolation -VMName "TestGW" -VMNetworkAdapterName "IntNIC" -MultiTenantStack ON -IsolationMode NativeVirtualSubnet

Set-VmNetworkAdapterIsolation : The operation failed.
Failed while applying switch port settings 'Ethernet Switch Port Isolation Settings' on switch 'HNVswitch8': One or more arguments are invalid (0x80070057).
A parameter that is not valid was passed to the operation.
At line:1 char:1
+ Set-VmNetworkAdapterIsolation -VMName "TestGW" -VMNetworkAdapterName "IntNIC" -M ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (Microsoft.HyperV.PowerShell.VMTask:VMTask) [Set-VmNetworkAdapterIsolation], VirtualizationOperationFailedException
    + FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.SetVmNetworkAdapterIsolationCommand