What are the IRS rules that prevent you from e-filing your federal return if you make federal tax withholding adjustments?

I am in a RDP. I was able to e-file last year with TurboTax online software even though I made federal tax withholding adjustments. Has something changed with the IRS rules, TurboTax software capabilities, or is this TurboTax message just wrong?

The exact message on the community property income tax withholding adjustments page is: "Note: If you make any federal tax withholding adjustments you will not be able to e-file your federal return according to IRS rules. You will need to print and mail in a paper copy of your federal return."