I would sort out the project frame rate mismatch first, unless you have mixed frame rates for whatever reason and need to be in 25p. If your footage is truly 23.976p. then why the need for 24.000p project type?
All that aside, I can make an S3D project with any project type. Perhaps you need to make new user settings, but once the project is created (regardless of frame rate), and you go to the “Format” TAB of the project window, you are saying you cannot select any of the default S3D views from the menu selection? This puts the project into “S3D” mode enabling the S3D feature set in other parts of the UI.
Michael