We are working on getting new keys and probably make a few changes to the system.
My original Stardock account, which is linked to Steam, has an eMail address with this pattern: "email@example.com".
This wasn't accepted by the giveaways. Could you white list this eMail domain, otherwise I guess I will have to merge accounts or ask support to change the e-mail address.
I made a second Stardock account because of this issue, but it was too late. The giveaways expired by the time I managed to activate the new Stardock account.
So far support just gave me a link to this thread.