@Ac68 There is a difference between a License Code (for Desktop) and an Activation Code (for Online). Error code 606 means the code you are entering is invalid. It can be because one digit (or more) is incorrected or you are trying to enter a Code for TurboTax Online in a Desktop software (or vice-versa). The codes for TurboTax Online will not work with TurboTax Desktop & vice-versa.
Can you tell us where you bought your product and exactly what it says on the box, if it's a retail purchase?
Thank you for choosing TurboTax.
