Earlier, there were problems with the 2023 SD100, in TT (But SD100 not being there was not one them). The latest update was supposed to take care of that.
TurboTax (TT) does not automatically prepare a School District return (form SD 100), you must initiate it.
At the screen, in the Ohio program, titled "A few things before we wrap up your state taxes" scroll down to School District taxes. Or later at the screen "Your 2023 Ohio Taxes are ready for us to check" -Click Other situations -Scroll down to School District taxes.