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
The issue is caused because the path that contains the custom unattend.xml file has a space in it.
An internal bug has been created for this issue.
Note: Symantec is actively investigating this issue.