The taxable amount of the 1099R withdrawal should be zero as I converted the entire amount to a ROTH via a backdoor conversion
Having same issue. What is the code in Box 7 in your 1099-R ?
My box 7 has a 7 in the field on my 1099R. I solved the issue by manually going into the "Forms" option and opening the IRA Contribution and Info Worksheets Forms (on the left) and manually entering the Roth conversion amount. In my case, it was $8,000.00 for the Roth conversion. Pay close attention to the IRA Info Worksheet line # 36 where the Roth conversion amount must be entered for myself and my spouse. All good now, thanks.
To report a Backdoor Roth in TurboTax, you have to first report your nondeductible IRA contribution and then report the 1099-R.
Click here for the steps on reporting a Backdoor Roth in TurboTax.