I found myself in an extended rejection loop with my 2020 return, trying many of the expert and user suggestions. Both it and 2019 were MFJs.
The initial rejection requested my spouse's AGI, although the submission process never even asked for such information (and never shows it anywhere). The official TTax advice was to provide the full AGI for both me and my spouse. It specifically says not to split the AGI between the 2 people and not to enter 0. So I followed this advice and got rejected. Since I had received my 2019 refund late November last year, I thought that my 2019 AGI was surely in the system. But I eventually tried to enter 0 as my AGI. That too was rejected. Ultimately, I got my return accepted by looking up the Self Select PINs I used for 2019 and entering them instead of the ones I made up this year. I then entered my actual AGI and resubmitted. The change of PINs may have been key to restarting the entire process. The return was rejected again, though I now got aother request for the spousal AGI. This time I entered 0 and the return was accepted.
Note: I eFiled with H&R Block in 2019, and recall I experienced a similar rejection scenario. {BTW, I found their software very disappointing and went back to TTax. I had used TTax since 1984-5 (back in the days of MacInTax) but gave up on it because Intuit did a couple of aggravating things with its products.]
It seems odd that the IRS uses such a simple, naive mechanism to screen eFilers, then cannot manage it. Maybe they'd rather reject lots of good returns than let a few fraudulent ones get through.
