Please make sure you really didn't register the key. Steam support will confirm when you signed up for Magrunner: Dark Pulse. The new winner says he can't use the key. It's written in a translator.

Hello konfiger.

It turns out that the original winner did activate the game and the reroll was requested by mistake. Since the game has been received by the first winner, we had to undo the reroll and mark them back as the winner.

Sorry about the confusion.