Around 12-April-20, with fully updated software, I again tried to e-file my son's tax return. I had not edited the form in any way. This time, the error message came back telling me I could not efile in his case (being the first filing for someone under 16 yo). So I gave up on efiling and filed by mail.
It would appear that I was never going to be able to efile for my son. So i wasted a good deal of time attempting to do the impossible. It would obviously have been nice to know earlier!
