If you're using TurboTax Online, you may have prepared your 2023 return under a different account. If you think that might apply, here's how to How to View My TurboTax Accounts.
In the desktop software the Tax History is still available in Forms Mode in the list of forms. If you can see your Tax History, but 2023 is missing, did you transfer your 2023 return into 2024? You could open your 2023 return in TurboTax and verify that it's correct. Make sure it's the same one you transferred to 2024.
If you open 2023 and there's no info (or wrong info), and you saved your tax file to a cloud-type storage last year, then downloaded it to use this year, it can become corrupted.
In that case, look for a .tax2023 backup copy, which may be on your computer. If you find a 2023 file with correct info, you can 'start a new return' and transfer in that file. However, you'll need to re-enter all the 2024 info.
If you're done with your 2024 return and about to file, you may want to sacrifice having your 2023 value on the 5-year report (or save the report from a correct 2023 return for your records).
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