It took a combination of witchcraft and sorcery, but after about 5 attempts my federal return was accepted. Initially my return was rejected with my actual 2019 AGI, or with '0' entered (I tried that because I filed on time but didn't get my federal refund until December.) But I think it was the following combination that did it for me:
1. In the 'Let's Get Ready to File Your Return' section, you can review various choices including identity verification. I did that and got the question, 'Did you, or someone on your behalf, file a 2019 tax return with the IRS last year?'
I did indeed, but for some reason TurboTax had 'One of both of us didn't file a return' selected. I believe this may have been because I tried changing my AGI to '0'. I changed the answer to 'We filed a return together'.
With that selected, I kept '0' as my AGI, re-submitted, and my return was just accepted.
So either there was a glitch when I first submitted with '0' as AGI, or going back and making sure I selected 'We filed a return together' was necessary (along with the right AGI.) I don't know if there's some additional flag that TurboTax sends to the IRS with your submission, besides the AGI number itself. If TurboTax assumes entering '0' for AGI means you didn't file a return last year, that may be the problem until you correct it.
