At this point, you may actually find it easier to do an SD 100 return by hand, than in TT. For the form, see https://www.tax.ohio.gov/portals/0/forms/ohio_individual/individual/2020/SDIT_SD100_Bundle.pdf
Or you can still file a 2017 return (state and/or school district) on the ODT web site:
https://www.tax.ohio.gov/ohio_individual/individual/filefaster.aspx
TurboTax (TT) does not automatically prepare a School District return, 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 2017 Ohio Taxes are ready for us to check"
-Click Other situations
-Scroll down to School District taxes.
