Grid Open (Injustice 2)

Generally, this problem the Steam version. I was a friend gave the key code to open it, the skin Grid.
When I took all the time he gives that account is already associated with the Mobile Injustice 2
it was even with the emulator BlueStacks downloaded the game,and from there wrote the key codes,and all the same.Grid still weighs the castle.
How can I do that would have a different account to register?
Can who faced such problem? Very desirable for the Grid to play.