@mnhemenway said "does not allow for a correction to refundable credits."
If you indicate that no one can claim you as a dependent, TurboTax (TT) will allow you the refundable portion of the AOTC, up to the amount of your tax liability.
In you indicate that someone CAN claim you as a dependent, you must also indicate that no one will actually claim you, to get the refundable portion of the AOTC, up to the amount of your tax liability. That is, you parents must forego the $500 dependent credit to allow you to claim the education credit.
To prepare an amended return, you sometimes have to go thru much of the interview, again, including the personal info and education sections
