Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello, good day and thanks for your question. To add to the above, if you just made this purchase, please check and wait within a 24 hours period and try it again and you can also use an alternative browser or use inPrivate or Incognito browsing mode and ensure that there is no typo on the code that you have. If you still encounter an issue, you can check or go back to Costco to report this to them as this is a third party and you can see the link below as a reference.