Thanks for posting in the Community space, ChrisSA.
I'd recommend contacting again our IOP Technical Support Team since this involves payroll correction. I know that you already reach out to us but only our technical supports have the tools that can pull up your account and add the S-Corp Health Insurance to your payroll. I can send feedback about your experience over the phone. I'd like to take this opportunity to better help you in a more efficient manner in the future.
You can refer to the Online Payroll section of this article to contact support.
If you have any other questions or concerns, just let me know and I'll get back to help.