When you answer Yes to the question asking if you had a Roth IRA open before 2018, TurboTax treats code T the same as code Q.
I can't imagine why TurboTax is not presenting the question. Perhaps in the version that you are using TurboTax presents the question after clicking the Done button. If you are using the CD/Download version, you can switch to forms mode, open the IRA Information Worksheet and mark the Yes box on the first line of Part V that Worksheet. (If the worksheet shows that you have any pre-2018 or 2018 basis in Roth conversions, perhaps TurboTax won't ask the question because it already knows the answer; check this worksheet. It's possible that the online and CD/download versions behave differently in this respect.)
