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Each platform has a different activation path. In some cases you need to download an app (like Steam or EA App) and in others you can activate the game key via a website (like Microsoft).

Here's a list of the most popular activation platforms with guides on how to activate your key on them:

Steam
EA App
Battle.net
Ubisoft Connect
Rockstar
GOG
Epic Games
XBOX (Microsoft)
Playstation
Nintendo
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