I found another post that said to leave the Payer's Federal ID Number blank. That worked for me. TurboTax accepted leaving that field blank and the electronic file was submitted.
I think in 2024, it's ridiculous that TurboTax has not fixed this problem or offered a help screen indicating to try all zeros, all nines, or leaving it blank. The posts have inidcated this has been an issue for many years.
