You see a key for $5 but it says "Region: Argentina." You live in the UK.
Depending on the key you buy, you will activate it on either the (formerly Origin) or Steam . For EA App Keys: fifa 21 activation key for pc
If you are simply looking for a free key: Websites claiming to generate a "FIFA 21 activation key for PC" are 100% malware, survey scams, or password stealers. There is no such thing as a working keygen. You see a key for $5 but it says "Region: Argentina
Since the game is no longer the newest entry, you can often find it at a discount on reputable key marketplaces: : Offers digital codes that you enter into the (formerly Origin) for instant download. fifa 21 activation key for pc