I have MDT and WDS configured for 1909 upgrades and it worked great - other than it installed pro, instead of enterprise. I found the command line to download the enterprise upgrade - but when launched out of WDS (MDT lighttouch.vbs) it moved all the users data over, but all programs were removed. Signing in was like signing in for the first time ever.
Any clues to Enterprise upgrades? I ran the Enterprise update directly (not with MDT/WDS) and it worked perfectly.