First question, why PowerCLI 6.5?
Did you already try rebooting the VM manually?
Does the OS Customization kick in in that case?
Sorry actually i was mistaken about powercli 6.5. I am using windows 10 powershell and just install-module Vmware.powercli and it grabs it from the windows powershell gallery(most recent version I am assuming)
Reboot the VM manually does not do anything it sits at logon screen.
The customization spec should sysprep and logon 1 time with an admin account. It works when done via the gui but not powercli.