I see the challenges in filing your Employer Payment Summary (EPS) to HMRC, @ben156. I'll direct you to the best support to help you fix this.
Since this issue has been escalated, I suggest routing back to our support team to acquire updates about this error you raised. Moreover, they can help you find ways how you can file it before the 19th of January to avoid being fined by HMRC.
For additional details about filing EPS via QuickBooks, check out this article: Submit EPS to HMRC for no employees paid in QuickBooks Standard Payroll.
Once you submit your EPS filings, you can visit this article to learn how you can access it: View submitted FPS and EPS filings in QuickBooks Online Standard Payroll.
Let us know if you have further questions about EPS filing issues or any related concerns. We'll be glad to help and see you back here. Take care always.