I am trying to get to grips with ZCM imaging and Windows 7.

I have a VM with the ZCM 11.2.2 agent installed.
I checked its image safe data and the machine name was W7-WM1 which is

I ran sysprep and shut down the machine. I rebooted this same VM and allowed
sysprep to do its thing.
When sysprep completed it reboot I shut the machine done and rebooted into
ZCM maintenance mode.

When I checked zisedit the machine had been given a completely random name
which was tehn written into windows.

What have I missed so that on completion of the sysprep the orginal image
safe data will be written back into windows?