Then it needs to be removed from the GA list. Only people who have it can enter.
Look at the example posted above. All 6 who were able to enter have it already. Otherwise you get "Missing Base game".
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It's not a DLC, it's a complete pack of the game + dlc. The only people who can enter it are those who already have it.
Example giveaway https://www.steamgifts.com/giveaway/UDBxn/one-last-chance-deluxe-edition
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