clone from windows start network adapter failed

I clone from windows template ，vm start but network adapter start failed，linux template is ok， what's wrong ? Thanks

edit nic

  device_change = []
  for device in vm.config.hardware.device:
      if isinstance(device, vim.vm.device.VirtualEthernetCard):
          nicspec = vim.vm.device.VirtualDeviceSpec()
          nicspec.operation = \
              vim.vm.device.VirtualDeviceSpec.Operation.edit
          nicspec.device = device
          nicspec.device.wakeOnLanEnabled = True
  
          network = pchelper.get_obj(
              content, [vim.dvs.DistributedVirtualPortgroup], network_name)
          dvs_port_connection = vim.dvs.PortConnection()
          dvs_port_connection.portgroupKey = network.key
          dvs_port_connection.switchUuid = \
              network.config.distributedVirtualSwitch.uuid
          nicspec.device.backing = \
              vim.vm.device.VirtualEthernetCard. \
                  DistributedVirtualPortBackingInfo()
          nicspec.device.backing.port = dvs_port_connection
  
          nicspec.device.connectable = \
              vim.vm.device.VirtualDevice.ConnectInfo()
          nicspec.device.connectable.startConnected = True
          nicspec.device.connectable.allowGuestControl = True
          nicspec.device.connectable.connected = True
          device_change.append(nicspec)
          break

clone

 clonespec = vim.vm.CloneSpec()
 clonespec.location = relospec
 clonespec.powerOn = power_on
 vmconf = vim.vm.ConfigSpec()
 vmconf.deviceChange = device_change
 clonespec.config = vmconf
 task = template.Clone(folder=destfolder, name=vm_name, spec=clonespec)
 self.wait_for_task(task)

Start by reproducing the Windows-template clone with the shown network-adapter edit and clone configuration, comparing it with the working Linux-template case. Inspect the adapter backing and connection settings in the clone specification; done means the cloned Windows VM starts with its network adapter connected.