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What you do is when you buy the game, you go back and check history thing. Then after that it will have a message saying needs to be verified (for first time accounts maybe?) click that. Then it will ask you to input your phone number.
Input phone number then you will receive code, input that code and then you can get your steam key. Activate on steam and play.
It's really good for 21.99 just it takes a while with all these instructions.