*I have base game : 18 Sep, 2018 TAL: Arctic Retail

Is this DLC relevant to you?
You own the base game

But SG saying : " Missing Base Game". And i can't enter :(
I think, it's coz "Steam is learning about this game".

And i see : "Entries - 0". Possible, nobody can enter

PS : Yes. "This bug makes that you can't enter to DLCs giveaways of which base game is Steam learning about."
https://www.steamgifts.com/discussion/LmWvh/bug-syncing-does-not-hide-owned-games-that-steam-is-learning-about#GZlYqFx