What is preventing you from e-filing the 2020 tax return? Did you get a reject for the 2019 AGI?
If so, enter a 0 (zero) for the 2019 AGI and e-file again.
The IRS does not have your 2019 AGI in their database since your 2019 return either has not been processed or it was processed late in 2020 or early in 2021.
