It sounds like you're a TurboTax Advantage member. I'm not sure why you haven't been able to login, but you do have to log in to the Advantage account specifically, versus the regular TurboTax account. Be sure you're using the same login info as you've always used and that you're signing into TurboTax ADVANTAGE.
If you didn't receive your CD as you typically do, it's possible that your payment info is no longer accurate. Be sure to check and update your TurboTax Advantage account information, making sure all the info there is current. I'm linking you to a TurboTax FAQ that should help you out. Be sure to see the associated helpful links at the bottom of the information, too. Please reply if you continue to have difficulty.
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Updating your Advantage info now will only affect the 2020 program sent out next November ... for 2019 you will need to purchase a 2019 program in another way. Either online directly at TT or from a qualified reseller in a brick and mortar store or online.