Welcome to the QuickBooks family, hilary-bennett.
Thanks for reaching out to us here in the Community. I can point you in the right direction about correcting the FPS. You can if you have rolled back the payroll and then amended the payroll, send a new FPS and mark it is a correction to a previous submission. We have included a helpful article on all things FPS in Standard payroll - Submit FPS to HMRC in QBOP
For more in-depth information, check out this article: https://www.gov.uk/payroll-errors/correcting-your-fps-or-eps.
If you have questions about QuickBooks, please reach out. I’m more than happy to help. Have a good one.