Found resolution on windows 10.
I had this problem too on 2023. I was not able efile my state return but was able to efile my federal. Support said I need to restart my router lol.
I uninstalled the whole thing and reinstalled it .... this time on my c:\ (previously I had it installed not on c:). Then it worked. I am willing to bet $100 they have a bug where they hardcode c:\ somewhere.
