Same for me, never claimed the code before trying today and its greyed out. I think once you enter your retail key on tue it may work. Some got lucky and got theres already. Not sure what the resaon is to be able to get it or not get it either way.
I'm having the same problem, I can't get the shuttle from the C-store but my brother was able to. Hopefully it will get fixed soon, I know its just a minor thing, but if its not working as intending who is the say the whole C-store is totally broken right now (hard to say for sure since the shuttle is the only item right now, if you have the option for it anyway.)
I was able to get it in beta, maybe picking it up them messed it up for me...who knows.