Why are gift cards region-locked, and how to pick the right country

Region-locking exists because brands run separate catalogues, currencies and tax rules per country. It is enforced by the brand at redemption, which is why no reseller can override it. This is the single most common reason a gift card cannot be used.

On PrivGift every product page states the country the card is valid in, and the catalogue can be filtered by country so you only see cards that will work for your account.