Your unattend.xml can still use the "work" network location; it may be deprecated in Windows 10, but it is not removed. We still use this so that we only have to have 1 unattend for Win7, Win8, and Win10. That's not to say it wont be removed in the future, but we'll cross that bridge when we come to it.
Under the pass OOBSystem, put this:
This will prevent that.