At first, I wasn't able to redeem product code with my Steam account after I order the digital download of Mortal Kombat X. Luckily, I am glad that Steam activation was successful after I redeem the product code.
It took nearly few seconds to get my product code after I order the digital download. All you have to do is click on Account Tab, My Orders Tab, Click Get Code, and then it requires your phone number for verification. Once you hear your phone ringing, you just pick it up and then you will hear automated female bot and she'll then tell you the four digit numbers. Once you fill in the four digit numbers, the product code will be revealed. And voila, copy the product code and then paste the product code to your Steam account, and the game will be activated with your Steam permanently.
I just didn't understand why it cost $60 on Steam whereas Cdkey.com costs $9.24 for limited time only.