And it always returns the 0x52e error ?
That is definitely a logon failure.
Is there anything in the Security eventlogs on your DCs ?
Or is the network net connected ? Could it be a 802.1x problem ? Is that VM allowed to connect to the network ?
Still find it strange that you don't have any logs of the customisation process.
The sysprep process that is driving this always produces some of these logs.