I am not expert about these kind of topics but could you check if is there any file remain in AppData folder. Maybe if you delete that it will solve your problem.
Hello, I have the same problem!
reinstalled the game, uninstalled and reinstalled Battleye, turned off the firewall.
as soon as I turn on it marks me as logged in with the name but as soon as I try to enter a server it throws me out giving me the identification error