I just filed a 2024 return electronically, and it was rejected by IRS.
TurboTax says:
"The IRS couldn't confirm your identity.
It looks like the AGI amount amount you used to e-file you federal return wasn't a match to what the IRS has in their database."
The AGI amount was prefilled in by TurboTax from the 2023 TuboTax file.
I double checked it and the AGI matches what is on line 11 of the 1040 on the PDF copy of the 2023 return.
It is 2 digits, a comma, and 3 digits with a period.
What else can be the problem?
THIS IS AN EDIT AFTER TRYING xmasbaby0's reply.
Replacing the 2023 AGI with "0." worked.
Don't know why, but can't question success.
