Total War: Shogun 2 DLC giveaways cannot be entered

Hello SteamGifts community,

I would like to point out that DLC giveaways for the game "Total War: Shogun 2" are bugged; users will always get the message "Missing base game".

• The Ikko Ikki Clan Pack
• The Otomo Clan Pack
• The Saints and Heroes Pack
• The Dragon War battle Pack
• The Sengoku Jidai Unit Pack
• The Rise of the Samurai Campaign
• Blood Pack
• The Hattori Clan Pack

Likewise, DLC giveaways for the standalone expansion, called Total War: Shogun 2: Fall of the Samurai are bugged as the above -- they cannot be entered either.

The DLCs for this expansion are:

1- The Saga Faction Pack
2- The Obama Faction Pack -- this is unrelated to your president
3- The Tsu Faction Pack
4- The Sendai Faction Pack
5- Blood Pack for FoTS

This has been the case for a year or longer. I hope this issue(s) gets addressed soon.