Assassination of Earl of Cardigan (Assassin's Creed: Syndicate)

Good day! Help anyone with what they can, the problem is this. It is impossible to steal the password from the man to get behind the closed door and kill the target, when I come up to this man, the actions "steal" are not highlighted, I have already climbed everything. Can eat how to kill him differently? Or is it a fucking game glitch? I play on PC. Thank you in advance