I'm having this issue with out of the box 10.13.1 computers, and ones that I reformat and will automatically install on 10.13.3.
I have the check box unchecked for Location Services in my prestage enrollment, yet setup assistant never asks me about location services. I always have to enable this later.
What am I missing? 
May be related to the new Express Setup grouping of settings. Check out this article
https://www.macblog.org/post/express-setup-location-services-time-zone-and-high-sierra/
Thanks!
Thank you very much for this post and link! We are experiencing the same thing and was wondering why Location Services would not show up.
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.