If you made a non-deductible contribution to your Traditional IRA in 2024 and then later converted it, you have to enter that non-deductible contribution explicitly. You do not just enter the prior basis.
Go to Deductions and Credits > Retirement and Investments > Traditional and Roth IRA Contributions and select Start or Update to get started.
Use the steps in the following TurboTax help article if you get stuck and need more explicit instructions:
How do I enter a backdoor Roth IRA conversion?
@Dave805
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