my product code has already been used

no one but me has access to this account for season 8 test for the new halo. i really wanted to play but steam says my code is already used how do i get this fixed

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> no one but me has access to this account for season 8 test for the new halo. i really wanted to play but steam says my code is already used how do i get this fixed

You travel back in time to when the Season 8 flight was on-going, lol.

In all seriousness, the flight for Season 8 ended about a week ago, maybe two.

Closing per the above, that flight has ended already