I won giveaway and received key for origin

no, its not. If you don't get a Steam key, ask the creator to give you one. Otherwise mark as not received.

It's not allowed.

No. It is not properly on steamgifts. Just need, to mark giveaway as received: not.

KILL HIM !

But seriously, just go to the support team with it.

No, you should contact the giveaway creator about this and kindly request a Steam key.

If the giveaway creator does not give you a Steam key within 7 days after the giveaway has ended, you can mark the giveaway as "not received" on your "won" page.

DO NOT mark the giveaway as received as long as the game is not in your library, this will only lead to a suspension for you! (if you have already marked it as received, simply click the checkbox again, to uncheck it).

thank you for all your answers. First, I'll write to giveaway creator

LIFE IS BRUTAL!

Just make sure to contact the person and ask for a proper Steam key. If you do not get a Steam key in 7 days then mark as "Not Received." Do NOT redeem the Origin code either.