I am in same situation, and because they show no return for 2019 even though there is code 610 on my on the Notice of non-Filing letter for 2019 (Payment received with return), my eFile for this year is being rejected because what I enter for my AGI of 2019 doesn't match their records. It doesn't match because the IRS HAS NO AGI for me because they think they have no record of my 2019 return. I have all my documentation for 2019 including US Mail return receipt confirmation. My Account Transcript online shows for 2019 a negative amount (a credit) for the amount of my check, and they did cash my check.
