Thank you!

The gift was region restricted, so you need to get a key from Humble Bundle (https://www.humblebundle.com/store/mountain) or another key seller.
If you don't, I will have to mark it as not received.

Everything's working this time, thanks! Marked as received!
Next time you either have to get a key this way, or point out that only people from your region can receive your gift. :)