Hello!
I've bought the game, and found that it is sold on Steam.
I like this platform and I wish I could integrate my key into it.
But it shows me "invalid key", although in-game and multiplayer that's OK.
Any ways to connect my Steam account and a key?
Looks like AAAA-AAAA-AAAA-AAAA-AAAA

Хер знает, вроде можно как-то. Но я не знаю как. Если у тебя не добавилась как обычно, то наверно нельзя временно.

WTF's that^^ anyway if youve bought the game on retail you cant use the key on steam but you can add it as a non steam game so you can chat to friends in game.
Click add game (bottom left of overlay) then add non steam game, find where its install and add it