I have install EEPC 6.x version on client machien and also added user to that machine but when i reboot machine then it shows that unknown username. How ever i tried user recovery and it is successfully done and after that the same error occured. I also tried machine recovery in the same machine but not bypass PBA screen and not get sucess.Any solution for the same.
Also want to know thar how i will know that user added that machine without configuring registry setting.
check the client log file - you also might want to check what naming convention you used - was it SAMAccountName or UserPrincipalName (shunt/simon hunt etc).