same for me - I bought it yesterday and activated in steam.
Afterwards I do get an information, that TWM2 will be playable after release...
So - what is the problem?
I just get in contact with Amazon and they will get in contact will the developers (YOU) and solve the problem, hopefully.
I´m a bit frustrated, because such an easy thing get on my nerve for the last 4 hours!!!
We are working with Amazon and Paradox to find out what the issue is and will try to resolve it as quickly as possible. I apologize for the delay.