If you are using the Business Edition, have you updated your software.
Since I do not personally use the Business Edition, this would be the procedure to update the TurboTax desktop personal editions - Click on Online at the top of the desktop program screen. Click on Check for Updates
Checking the TurboTax website for forms availability under Windows 1120 S S-Corporate and U.S.-Federal shows all instances of a 1120S as being available - https://form-status.app.intuit.com/tax-forms-availability/formsavailability?albRedirect=true&product...
