TCG NPC "Couldn't validate code"

90 Dwarf Hunter
I got a TCG loot card in my Cata CE. I successfully obtained an ingame code from the Blizzard site, but Landro Longshot won't accept it. I found a post by Bankze 02/22/09 with the same issue and followed the advice given - deleted wtf, cache and interface folders and restarted my PC. I'm not using any addon installer.
Please help.
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Customer Service
Sorry I am so late in replying to you Becchi, did you manage to resolve the issue?
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