Many 2020 e-filed returns have been rejected over an "incorrect" 2019 AGI - in many cases where the 2019 AGI was entered correctly.
The two most effective workarounds are to enter "0" as the AGI or to check that you did not file a return in 2019.
See What if I entered the correct AGI and I’m still getting an e-file reject? for additional information and your options if the above choices do not work.
