Thanks for your response.
I do see form 8606 was properly completed and included in my 2019 return. It properly records the full contributions my wife and I separately made to our own Traditional IRAs.
Maybe the issue is with the 2020 non-deductible contributions? I deleted the 1099-R's, and then entered the 2020 contributions before entering the 1099-R distributions / conversion, but still am generating a tax liability.
