NUKA WORLD \ GRANDCHESTER MANSION \ KEY

[SI]

Hello,
i have a problem with this mansion please. I got the key of the mansion from the robot before enter into the mansion. But when i try to open the first door, the system tell me the key is required .. snif :-( any ideas ? the save is 3 days in the past, and it's before i was arrived into Nuka world, so it's impossible. Do exist a way to relauch the mission ? Thx

[avenger]

You get in via the front door not back door.

You don't get a key from the robot -- you get a ticket from it. Or did you kill it and loot the key?

The back door you may have been required was for the back door which you get once you play the house from its main entrance.

[SI]

I killed it and loot the key.