Using the GUI unattent.xml creator I specify a domain and credentials to join.
It appears the password is stripped from the file by sysprep.
How do I join a domain during install? How is the password stored? Does it need to be encrypted? If so, how?
The unattend.xml creator has two fields for the credentials to join the domain, place the user ID and password in those fields and after OOBE/sysprep completes it will join the domain.