Enter your 1099-R exactly as it is shown (especially the Box 7 Code).
Pay attention to the follow-up questions in TurboTax after your entry.
Click the link for more info on How to Enter a 1099-R.
**Mark the post that answers your question by clicking on "Mark as Best Answer"
Also make sure that you entered your nondeductible traditional IRA contribution for 2019 and that your 2019 Form 8606 shows on line 2 the amount from line 14 of your 2018 Form 8606.
Finally, if you had other money in traditional IRAs, your Roth conversion is only partially nontaxable and your traditional IRAs retain the remainder of your basis in nondeductible traditional IRA contributions, shown on line 14 of your 2019 Form 8606.