I filed electronically and was rejected by the because EITHER the AGI and/or the PIN was not correct. The five digit PIN was populated with information from 2019's return. I logged into IRS and obtained a 6 digit PIN and tried to replace the 2019 PIN. The AGI's matched so I "knew" it must be a PIN problem. (I now know the IRS PIN <> TurboTax PIN.) Bottom line, I have become one with IRS rejection notification. I will mail my returns in. :(
