I am trying to e-file for 2020 for the first time. I get the IND-031-04 message (wrong AGI or 2019 PIN), so it must be AGI. However, AGI was correct. What can I do?

I have paper-filed using TT for 10 years. The IRS has not come back to me saying that my AGI (or anything else) on the 2019 return was altered or incorrect, yet my 2020 e-filing has been rejected.