We have both a Win7 and a Win10 instant clone environment currently in testing. Both Win7 clones and Win10 clones are placed in the same OU and have the same UEM settings and group policy assigned to them. All users have no issues logging in to the Win7 machines. If a new domains user, who as I said can logon to win7 without issue, attempts to log on to a Win10 clone, they are met with this error. If they have Domain Admin rights however, then can log in. Once they log in with the admin rights, if I take admin rights away, they will be able to log in after that as a normal domain user.
I've tripled checked my Group Policy is correct for UEM and the shares/perms are all good.