File: C:/Windows/System32/WdsUnattendTemplate.xml
<?xml version="1.0" encoding="utf-8" ?>
<unattend xmlns="urn:schemas-microsoft-com:unattend">
<settings pass="specialize">
<component name="Microsoft-Windows-UnattendedJoin" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" processorArchitecture="amd64">
<Identification>
<UnsecureJoin>true</UnsecureJoin>
</Identification>
</component>
<component name="Microsoft-Windows-Shell-Setup" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" processorArchitecture="amd64">
</component>
</settings>
</unattend>