It was because I used three cards to Blackjack that I didn't receive credit for the Natural Blackjack which was specified in the weekly challenge.
I started a Single-Player Blackjack game sometime pretty close to 7:00 PM EST on President's Day. In the second game I played, my first two cards equaled 11. I opted to double my bet and I was dealt a Face Card. A "21 Blackjack" flashed over my game hand, but I didn't receive credit for the blackjack.
I stopped playing immediately and looked up the definition of a natural blackjack. Here is what I found: "A Natural Blackjack is a total of 21 in your first two cards. As a result, a Blackjack is an ACE and a card of equal value to 10, with the condition that they have that is your first two cards."
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