Thats a bug which a lot of users are having right now. Contact Red Bull directly and make sure you keep the cans with the code on it as they will ask you to provide a picture of the can with the code on it. Eventually you should get another code. I would suggest not using it as long as the bug has not been fixed.
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Thanks. Interestingly, they finally showed up in my postmaster last night. They were not there before but I have the focussed lights now. Not sure why they took so long to show up.