Here's a couple of things you can try. Open 2023 TurboTax and look at your 2023 return to see if it is correct. If so, Save it again and try your transfer to 2024 using that file. If you saved your 2023 return to a removable drive and then downloaded it to start 2024, it may have become corrupted.
If you think this may apply, check your TurboTax folders for a back-up copy of your 2023 return (usually there's at least one) and try transferring that file to 2024.
Another thing to try is a Manual Update, even if the Online shows no updates are pending. It's also advisable to turn off your anti-virus programs, and run as Administrator when using TurboTax (right-click TurboTax icon). Here's How to Turn Off Anti-Virus Programs and more info on Troubleshooting TurboTax Desktop Issues.
Here's how to Contact TurboTax Support for more help.
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