2020Fed/State just got rejected due to "incorrect 2019 AGI". but it is the correct AGI calculated last year. i have a copy on my desktop AND a printed copy.

[userredlocs_99]

i filed 2019 late (on Dec 23, 2020) and had to snail mail my filings to both Federal and the State. I have since rec'd both the 2019 Fed and State refund. So, though late, it was not contested.   i have now  just completed my 2020 filings (in June 2021), and was just rejected due to "incorrect 2019 AGI".  however, TTax autopopulated the figure, and i have a hardcopy printed confirming the AGI used. AND i have handwritten the PIN number used.    why was it rejected, and what to do?

[DoninGA]

Since the 2019 federal tax return was mailed late in 2020 the IRS will not have the 2019 AGI in their database.

Enter a 0 (zero) for the 2019 AGI and e-file the 2020 tax return again.