It was a single return on behalf of my daughter. I don't have an IRS account for her, and didn't bother to check the AGI - only using the 2020 AGI that was in TurboTax. As soon as I put in zero in the AGI box, the IRS accepted it.
It would have been a double-hassle if I couldn't get it accepted, because California requires my daughter to file her state return electronically, and the California Franchise Tax Board rejected the state e-file until the Federal return was accepted.
