Go back to your mail and find the message. If you didn't claim it, it will be there. If you didn't get the message, you probably didnt update the game yet.
As others have been kind enough to mention, I would first recommend making sure you have updated to the newest version of the game and then checking your inbox again. You can also check the "Rewards" section of your stash as well, since it should also be visible there.
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