Since the message you are seeing is related to the 2023 contribution, revisit that section of your return where you entered the Traditional IRA non-deductible contribution for 2023. Just double-check your answers in that section and see if the error goes away.
Also, if it does not, take a look at the following TurboTax help article to see the process step-by-step:
How do I enter a backdoor Roth IRA conversion?
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