Same here.
I only figured it out because my file for 2020 kept getting 'rejected' because my AGI didn't match.
When I looked at the IRS transcript, they have no record of my filing, but accepted my payment. I got a state revenue expert on the phone and she said to re-send them in this year.
I did find that if you change your option on last year's AGI to "I didn't file last year" and '0" they will be accepted because they are really just looking for a match for their records.
I'm resending my 2019 return by mail and crossing my fingers it goes through this time.
