What information do I need to put on PAYE app for a backdated Employment allowance claim?

We automatically send EPS forms via our accounting software however have become aware that we did not apply for employment allowance for the previous 2 years. I am trying to backdate this using the HMRC Basic PAYE app - do I need to upload all the employee details and payroll information for previous years to the app to do this? (These details have already been submitted via Xero). Or can I just complete the employment allowance claim and submit?

Hi.
 

You may be able to just send an eps marking that you are eligible to claim it .

Thank you .