I spent 155 Strange Coins today on legacy engrams trying to get the last remaining year 1 secondary (4th Horseman). I already have the year 2 version and it is my belief that is the reason I could not receive it today. The cause may lie in the way that the RNG works. I believe that the smart engram is looking at the Grimoire card on my account. Since I have the year 2 weapon, the Grimoire card is already unlocked.
Please look into this.
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It's not a bug, RNG is RNG. You aren't going to get, and don't deserve, a refund just because you didn't get what you wanted. Why do you need the year 1 version anyway if you've already gotten a year 2 version?