Quote:
Originally Posted by sufue
I also read another theory somewhere, probably in this thread, which is that you can only use one of each "type" of code - i.e. one 90% code, one 50% code, etc. per account. So going by that theory, even if it were a new code, but you'd used some other 50% code in the past, it wouldn't work. I haven't ever gotten up the energy to try to test this theory, but if anyone has, it would be interesting to hear how it worked out.
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I read the same here. However, I've used 90% off multiple times, as well as 50% more than a dozen. I've even changed emails for my Kobo account and been able to use the 'Welcome' code twice. However, like you and others, I've also received codes that wouldn't work.