Uhm, hi where are you from? It's a region restricted giveaway to the US, and I activated a similar key to my US account without issue, I'm from AZ. Your steam account also shows up as being from the US but I can't tell if that's from the US Virgin Islands, Puerto Rico or something like that. My other giveaway for this also in the US was activated successfully.

Regardless I suppose sorry and yeah mark it as not received but more info would be appreciated. Thanks ^_^