Invalid Grim Dawn key?

Hey everyone,

Quick question. I backed Grim Dawn on Kickstarter back in the day. I got some co-op bundle with 2 keys, both for the game and first expansion. To make a long story short, I split the cost with a friend, who was no longer able to use the key, long before release. Now I still have the key, I looked on Humble Bundle, it was not revealed. Now I revealed it, planning to give it to my girlfriend so she could get the first expansion whenever it comes out. She already own Grim Dawn though, and the product activation in Steam says the key is invalid.

Does anyone know if these old keys just got deactivated or something?

Thanks in advance.

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Invalid Grim Dawn key?