The Federal Office of Management and Budget (OMB you'll notice on tax forms) must approve all tax forms. then the approved forms must be programmed by the tax software companies. Your return contains a form or forms that were probably based on 2022 until they're updated for 2023 you'll get this message and can not e-file. Nor should you mail because certain ones will contain computations based on 2022 not 2023.
