This issue seems like this ticket.
https://www.steamgifts.com/discussion/CRvot/total-war-shogun-2-dlc-giveaways-cannot-be-entered
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From my giveaway:
https://www.steamgifts.com/giveaway/SqKcA/total-war-shogun-2-rise-of-the-samurai-campaign
No one can enter it. It says "Missing Base Game".
As gangnamstyle suggests, SteamDB seems to have two AppID's for the base game (34330, 201270).
refer: https://steamdb.info/app/34343/info/
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