There is an actual discussion by a support member here that details this. You should search the stuff and find the things.
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I am feeling nice, I did the searching for you, as it is a difficult quest to do - http://www.steamgifts.com/discussion/0Rsiq/if-theres-a-free-weekend-you-sync-your-account-and-then-cant-enter-a-giveaway
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