The Humble gift link warning had this:

This key is only available in the countries listed below. AE AF AO AZ BH BI BJ BW CD CF CG CI CM DZ EG EH ER ET GA GH GM GN GQ GW IQ IR JO KE KH KM KW LB LR LS LY MA ML MR MW MZ NA NE OM PS QA RW SA SD SL SN SO SS SY SZ TD TG TN TT TZ UG YE ZA ZM ZW