The software you purchased from Costco was supposed to be installed on your personal computer so that you could complete and file your tax returns using the installed software. The License code could only be used with the installed software, not using the TurboTax online web-based editons.
Since you completed and filed your 2019 tax returns using the TurboTax online web-based editions and not the software you purchased from Costco, you should return the software to Costco for a refund.
