"when I enter it in, it denies it saying that's not my AGI"
What do you mean by "it denies?" Are you referring to a rejection notice? Does that mean you efiled your return, and then you got a rejection error notice and code from the IRS?
Are you filing as single? I assume that figure is the AGI from your 2023 original return (as it should be), not an amended one.
If you efiled and got a rejection notice about your 2023 AGI, sometimes the IRS database is not up to date if someone filed the 2023 return late in the year, such as after October 2024. Did you file after October? At other times it's unknown why the IRS database won't accept it. In any case try using an AGI of 0 (zero) and see if that works.
