See this TurboTax support FAQ for the rejection code received from the IRS - https://ttlc.intuit.com/community/rejections/help/e-file-reject-ind-031-04-or-ind-032-04-the-agi-or-...
If you filed the 2018 tax return late in 2019 or in 2020, then the IRS does not have your 2018 AGI on file. Enter a 0 (zero) for the 2018 AGI and e-file again.
If this is also rejected then you will have to print and mail the tax return.
See this TurboTax support FAQ for printing a tax return for mailing - https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online...
