Adding a business (schedule C) to my return causes TurboTax Desktop to indicate that I must file by mail (no e-file)

After completing my taxes using TurboTax Desktop 2023, I receive a message regarding my Federal Return stating "This return has certain forms that can't be e-filled, usually because of tax regulations, so you'll need to print and file by mail."

 

If I remove the business (which deletes the corresponding forms the primary being the Schedule C), then I am able to get past the e-filing selection screen and it has no problems.

 

I know that I have filed previous taxes with a Schedule C and e-filing was not a problem.  Could this be a bug in the TurboTax Desksop software or can you truly no longer e-file with a Schedule C?