That's odd.I tried the four steps it still not working for me. I will have to wait until they fix it.
Then, since the official support page is already available for GWENT: Rogue Mage (↓), you should send a ticket.
Unlocking GWENT: The Witcher Card Game goodies for purchasing GWENT: Rogue Mage Deluxe Edition — GWENT: Rogue Mage | Technical Support — CD PROJEKT RED
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FYI, the official FAQ just in case: