I am filing in state of Florida, i.e., there is no State forms required. Federal e-filing transmission didn't go through.
TT says "Transmission Failed: FAILED VALIDATION. There is an update available to your version of TurboTax... "
I have checked for updates and it says it is up to date.
I have seen countless other people reporting the exact same issue. Intuit you need to fix this issue ASAP.
Here's details on Filing Federal and State Returns Separately.
You could also try a Manual Update and disabling your anti-virus software. Here's How to Turn Off Anti-Virus Programs.
I had the same issue when I went to e-file. I just bought the software two days ago so thought it would be current enough. I saved the return, closed the app, reopened the app - - - which defaults to "check for updates" - - - so agreed to that. Reopened and was returned to the right spot and successfully e-filed. A glitch that does need to be fixed 😉