I am trying to create a basic Windows server 2016 template in RHV 4.3 . I've installed the OS from the Windows DVD, and installed all the RHV tools, and drivers.  Then I do a sysprep on my windows VM and make a template from it. 

I'd like to inject the product key when the template is cloned.   I thought if we define the product key in /etc/ovirt-engine/osinfo.conf.d/10-productkeys.properties. with something like this:

# Windows2016x64(29, OsType.Windows, true); os.windows_2016x64.id.value = 29 os.windows_2016x64.name.value = Windows 2016 x64 os.windows_2016x64.derivedFrom.value = windows_2012R2x64 os.windows_2016x64.cpu.unsupported.value = conroe, penryn, nehalem, opteron_g1 os.windows_2016x64.sysprepPath.value = ${ENGINE_USR}/conf/sysprep/sysprep.2k16x64 os.windows_2016x64.productKey.value = MY-WIN-PRODUCT-KEY

That it would insert the product key when we tick the "Cloud Init / Sysprep" box on the run-once dialog.  Now, I know this is semi-working, because all the other things I define in the run-once dialog after clicking sysprep works:  Admin password, hostname, etc.  But NOT the product key!

I have even tried hard coding the product key in the  sysprep.2k16x64 file and no luck.

What am I doing wrong here?