You can check your 2019 AGI on the IRS site just to be sure that you are entering the right amount. BUT I had exactly this same problem. I verified and re-verified that the AGI was right and return was still rejected for wrong AGI.
Somewhere I read that if your return wasn't processed by the IRS by around Nov 2020, you needed to enter AGI of 0
I entered 0 and amazingly my return was accepted.
This is something like the Form 1116 and the Forms 8453/8949 errors that TT should flag for users or flag and fix.
So much time has been invested by all the frustrated people trying to figure out what's wrong (when TT isn't saying or helping).
