I just got off the phone with TurboTax. Instead of entering 0 for AGI, he walked me through some steps to go back and check "didn't file return." Since IRS has no record of my 2019 return yet, he said it'll go through. For the record, this was the third call I made to TurboTax to "fix my rejected return" and he was the only one (name is Joshua) that knew how to fix the problem.
