Based on the information you shared, it seems like the basis of the Traditional IRA accounts that were converted to Roth IRAs may not be entered into your tax return.
If you made the non-deductible contributions to the Traditional IRA in the 2024 calendar year, then you need to report those contributions as part of your return. This should make the Roth IRA conversion non-taxable unless there was a lag between the contribution and the conversion and the account grew in value during that lag.
Take a look at the TurboTax article below for guidance to enter the Traditional IRA contribution information. If this does not cover all of your questions, please add some additional information. You referenced another thread in your question, but your question stood alone without any prior threads.
How do I enter a backdoor Roth IRA conversion?
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