I have called in to TT twice about this. The first person I spoke with said I had to file my Federal return first and have that accepted then file the State return. I did that and I still cannot efile my State return. It says that the IA 8453 is not supported is this why? and if not why not? I really want to get this filed and off my desk.
Have you tried deleting Form IA-8453 from your state return using Forms Mode?
If that doesn't work, it would be helpful to have a TurboTax ".tax2023" file that is experiencing this issue.
If you would be willing to send us a “diagnostic” file that has your “numbers” but not your personal information, please follow these instructions:
In TurboTax Desktop, open your return and go to Online in the TurboTax header. (On a Mac computer, choose File >> Share.)
We will then be able to see the same experience you are having. If we are able to determine the cause, we'll reply here and provide you with a resolution.