Ubisoft Support no longer supports key recovery for GRAW. Since the game is considered "end of life," they will direct you to purchase the digital re-release.
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If purchased from sites like G2A or AllKeyShop , the code should be provided in your purchase history or confirmation email. Troubleshooting Common Activation Issues Ghost Recon Advanced Warfighter 16 Digit Code
Launch the client, go to Library , select GRAW, then navigate to Manage > Properties > Display Keys to view your code. Ubisoft Support no longer supports key recovery for GRAW