Have a problem with a won giveaway - game doesn't activate

maybe the key its beta key to, and not the full game.

can you try to remove the license for the beta you have? https://store.steampowered.com/account/licenses/

^^ What Mullins said.

Then see if the one you won is the full game or the beta ;)

First Remove the beta Key and then activate the full key.

In form the giveaway maker that its not working.

If he doesn't provide a working key or gift for the game in 7 days mark as not received.

you might want to contact support and see what they have to say about it, but the above is pretty much all you can do.

If you won a game and seems problem with activation...
just write a pm to mrssadisticchicken: "How are you?"

this not helps you. but helps for her. to eternity!
Everyone! Get in here!

Well, I even told you about it. Make him work to get your game or just wait 7days and mark it as not received. I warn you about his key

I knew that's going to happen, that's why I didn't enter for that giveaway. I even warned people in that giveaway making a comment saying that it's the first giveaway that person made and that he doesn't have the game in his inventory. And yet people joined anyway.