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I am dealing with this issue right now, I was just on the phone with Intuit TurboTax and they said Costco was supposed to supply purchasers with the unique 16 character code (letters and numbers), but they failed to do so. None of the information on the receipt is that code as verified by Intuit customer service. There was no direction from the cashier to go to order pickup to "pick up" this 16 character code either in case that was the solution.  Someone somewhere messed this up royally as Intuit told me that they are starting to receive this same question over and over again regarding Costco TurboTax purchases and it's only January, can't imagine the fiasco as April draws near. Any advice out there?