I had the same issue. I am not yet sure if this is related to a problem I am having with the IRS.
I submitted both state and federal returns on time. I then realized my state return needed a correction. I only submitted my CA state amended return. As of yesterday, I tried to submit my 2020 taxes and found out through IRS.GOV that the Fed says I did not submit my federal return. This is very odd, as they have an account transcript showing that I paid my taxes, but no taxes were filed. Then there is another document "Form W-2 Wage and Tax Statement" that has all my tax information. Do I have to send in the 1040x? If not, how can I find my old 1040 to send in, as I don't see it in TurboTax?
