Due to Corona, the IRS still hasn't processed my 2019 taxes. Contacting them they stated I should enter $0 for my 2019 AGI when asked by TTax. Where is that be in TTax?

The IRS mentioned that I had to enter $0 "because that's what our computer will have in the system until we clear the backlog of 2019 filings".  My 2019 AGI was clearly not $0 but this is what they told me to do and I'm saving their letter!