Thank you for reaching the Community, enquiries38.
I'm here to share some information about employment allowance in QuickBooks Online Payroll.
Employment Allowance can only be claimed in QuickBooks for the current tax year. Since you've manage to submit your EPS, you'll need to contact HMRC to see if there's an option for you to claim for the previous tax year using their Basic Tools system.
You can also use this article as a guide to finish the current tax year and plan for the next: Year-end guide 2022/2023 for Standard Payroll.
Please don't hesitate to drop a comment on this thread if you need additional assistance. I'll be here to assist. Have a great day!