Having the same issue. It seems when the CopyProfile copies over the Administrator user into Default User the profile is becoming corrupt somehow.
I thought this might be an 1809 issue as that is what I'm working on building, however I also tried going back to 1803 and the same issue exists.
Going to mail EUC and see if I can get any feedback on this. Confirmed this is an issue with the guide as it stands right now.
ESXi 6.7