Humble Bundle Region Locked game HELP!!!

I am not. I just sent someone a key and he can't activate it, but he is same region as me.

Because not all companies use the same regions as Steam typically uses. Bethesda for example use RHCP and EMEA rather than the more common EU/RU-CIS split.If either 2K or their distibutor used similar regions it could be that Poland and Russia are considered part of the same region and as such would get the same "Russian" keys rather than EU/WW keys.

I'm not sure if that is what's happened but if it is there's nothing that Humble will be able to do about it as all authorised retailers will have been provided with those same keys. In future make sure you generate a gift link from Humble rather than a key as generating the link will actually tell you any region restrictions in place on that item.