If the IRS is rejecting your 2020 e-filed federal tax return for the 2019 AGI then enter a 0 (zero) for the 2019 AGI and e-file the 2020 tax return again.
there are many reasons for rejection. it could be AGI or something else. to give you specifics we would need to know the complete reject message including code if any.
You have clicked a link to a site outside of the TurboTax Community. By clicking "Continue", you will leave the Community and be taken to that site instead.