Instead of amending your 2024 return to include Form 8606, you should file the Form 8606 on its own to report the basis from the 2024 non-deductible contributions. You will need to complete this form on your own rather than through TurboTax.
There is further information about this in the following TurboTax help article. Scroll to the bottom of the document to find the section If your conversion contains contributions made in 2025 for 2024 for guidance. There is also a link to a blank Form 8606 you can use.
How do I enter a backdoor Roth IRA conversion?
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