Can't enter some giveaways

There is already a thread about this.

Try resynching once more?

Force Sync again, it will go away.

Keep pressing the sync button at exactly 50MPH until your mouse explodes.

If you played the game during the free weekend, you can't enter giveaways folr that game because it's listed on your games list. SteamGifts staff is aware of this and is looking for a solution. Until one is found you can't enter these giveaways.

Next time also use the search on the forums before making a topic(more than 1 exists of this topic)