Rassemblez les bonnes preuves avant de contacter le support : les signalements avec captures complètes sont résolus bien plus vite.
Are you activating the game on the right platform?
Did you copy the key correctly?
Did you try following the key activation guide?
How to contact Steam Support
How to report a used key (Steam)
How to report a wrong region key (Steam)
How to report a used key (PlayStation)
How to report a wrong region key (PlayStation)
How to report a used key (Xbox)
How to report a wrong region key (Xbox)
How to report a used key (Nintendo)
How to report a wrong region key (Nintendo)