This is not an SAP support forum. but according to the SAP documentation: https://blogs.sap.com/2021/06/10/how-to-generate-a-new-s-user-id/
https://blogs.sap.com/2021/03/09/learn-all-about-s-user-ids/
You can create an S user and authorisation with a super administrator account.
It sounds like this needs to be done within SAP by an authorised user.