You don’t really say which form is causing the issue, but there are certain forms that the IRS can't accept via e-file submission.
Only the forms shown in the Tax year 2023 accepted forms and schedules for individual tax returns and extensions spreadsheet on the IRS' Tax year 2023 Modernized e-File schema and business rules for individual tax returns and extensions page can be filed electronically.
There are a number of other reasons a return can’t be filed electronically. See the TurboTax Help article Why can't I e-file my return? for more information.
If this information isn’t helpful, please post back with more detail.
