I have been having the same issue as everyone else.
I installed the manual update and also online updates with no resolution.
I was able to file federal tax once I decoupled my state (KS), but still could not file KS due to the FAILED VALIDATION error.
Today I uninstalled and reinstalled TurboTax. It was right after that that I was able to file my state tax.
May be worth it to try uninstalling and reinstalling TT. It was not very painful.
Good luck to ALL!
