I was having the same issue today while filing federal and state (Maryland). I had taked extension and tried to file today. I was with the TT support for more than 2 hours and she asked me to install the most updated Windows 11 patch and any other optional update via setting >windows update. I installed them but it still did not work and got the Failed Validation during transmission
Then she asked me to remove MS visual C++ 2015 from the installed apps, and I had two of those that I uninstalled. Then she asked me to uninstall TT2024 from the installed apps and I did that too,
During reinstall, it also installed MS visual C++ 2022 and installed the TT 2024. After re-install it did update the state again. I checked again for any update and there was none,
I opened the saved tax file and tried to file both the returns again and it worked!!
GP
