Based on your question and the lines that you say are blank on
Form 8606, it appears that the Form 1099-R that reported the distribution from
the Traditional IRA (which was converted to the Roth IRA) has not been entered
or was not entered correctly.
Go back through the 1099-R entries for your return to be sure that
the correct ‘owner’ of each form has been reported. Also, be sure to complete all the follow-up
questions in the Form 1099-R section until the program returns you back to the
main income screen.
For your reference, see the information below for step-by-step
instructions to enter a Back Door Roth contribution using TurboTax.
https://ttlc.intuit.com/replies/6590395
