The IRS has not finalized (form) Schedule 1-A. Therefore, TurboTax (TT) has not yet included it in the software. You'll have to wait for the update, currently expected Jan 14.
For more info, on form availability, see
https://ttlc.intuit.com/turbotax-support/en-us/help-article/taxation/irs-forms-availability-table-tu...
