Custom unattend.xml file is not being properly imported into the itemversiondata table for the deploy image task.
The logs in automation will show that the template unattend.xml file is the one in the nscap share and not the one provided by the customer
ITMS 8.x
The issue is caused because the path that contains the custom unattend.xml file has a space in it.
For example: nscap\custom unattend\unattend.xml
An internal bug has been created for this issue.
Workaround: