WDS unattended join

Hello everyone!

I'm trying to unattended set up Windows 8.1, and I faced with some issues.

1. In my unattended.xml I tried to name computers both like pc%02# and %MACHINENAME%. none of this worked
2. when the computer tried to join to the domain, I see following error in Event Viewer: The computer XXX tried to join to the domain YYY but failed. Error code 234. EventID: 4097, Source: NetJoin

What's the reason of this behavior?

Checked: user in unattended.xml has enough rights to join to the domain.