The answer above is not correct. I also got a message I had to mail my return because TurboTax does NOT support E-filing of MO-TC. If this is a Missouri State issue and not a TurboTax issues, I suggest TurboTax work this out with the MO Department of Revenue, if possible.
Here's my suggested work-around that I will try. E-file without the MO-TC and then file an amended return to claim the credit. Should make the process much simpler.
