Thanks for actively responding, @SteveDonoho. I appreciate you for doing all the possible troubleshooting to fix the issue.
Since the withholding taxes are still not calculating even after performing all the fixes, I'd recommend contacting our QuickBooks Payroll team. They can check your account to identify what's causing this to happen and help you resolve the problem.
For future reference, read through these articles to learn more about Federal forms instructions for the coming tax season:
Feel free to get back and post some more questions here in the Community, @SteveDonoho. I'd be happy to answer your next posts.