My humble apologies. The key was received as part of Indiegala's Feudalife challenges, which tends to give duplicate (or even invalid) keys from time to time. Considering that I own the game already, the error I received only stated that I already own it, and nothing about it having been activated already by someone. I should probably refrain from using these keys in giveaways in the future. Other than that, I don't know what to tell you, mark it as 'not received'. The blame is mine.