When i create giveaway, i select humblebundle region (europe) so
The key can be activated in these countries:
Åland Islands
Albania
Andorra
Austria
Belgium
Bosnia and Herzegovina
British Antarctic Territory
British Indian Ocean Territory
Bulgaria
Cayman Islands
Croatia
Cyprus
Czech Republic
Denmark
Estonia
Falkland Islands
Faroe Islands
Finland
France
French Guiana
Georgia
Germany
Gibraltar
Greece
Guadeloupe
Guernsey
Hungary
Iceland
Ireland
Isle of Man
Italy
Jersey
Latvia
Liechtenstein
Lithuania
Luxembourg
Macedonia
Malta
Martinique
Mayotte
Monaco
Montserrat
Netherlands
Norway
Poland
Portugal
Réunion
Romania
Saint Helena
San Marino
Slovakia
Slovenia
South Georgia and the South Sandwich Islands
Spain
Svalbard and Jan Mayen
Sweden
Switzerland
Turkey
Turks and Caicos Islands
United Kingdom
Vatican City

Your welcome, enjoy it. :)