They are way behind. If you filed a paper return it probably has not been entered yet (they process the cash fast but not the return). If you put in the correct AGI it will not work until your return is processed. Put in zero ($0) is supposed to make it work in this case according to the IRS website https://www.irs.gov/newsroom/irs-operations-during-covid-19-mission-critical-functions-continue
Under Individual 2019 tax returns (hit the plus and scroll down to the bottom of that section and you will see 2020 filing info).
