23 hours of playing and i just realized that my game is a deluxe edition. Now i´m trying to activate it from here via Steam but it doesnt work. Steam Guard still wants a new activation Code and it doesn´t work anymore... 

Could you specify at which step of linking your Steam account you are having an issue? Thank you!

Sure! (I´m sorry for bad english skills, i´m a young student from Germany) I´m trying to link my Steam Account with games2gether but it doesn´t work (i want to to this because i think the deluxe Edition will be activated by this connection). So i was about to verify my Steam Account and after i entered the code which was sent to my email, the Tab closed and i had to do it all over just to do it again and again. I´ve turned all anti-Tracker Add-ons all Cookie-Blockers (Chrome) and it still doesn´t work... I hope you understand what i meant to say.