User account not creating (provisioning) in custom target system

Hi,

OneiM Version 8.2.1

I have a custom target application. It is a Web application that uses SQL Server as a backend database. I integrated using ADO.NET connector as a custom target system. I have configured the synchronization project and onboarded the application into OneIM database(UNSAccountB table) and We have synced and created users from Sql Server to One IM.
Custom application assignment is on a request basis. After assigning the account definition to the user, the user is creating in OneIM database(UNSAccountB table) but that user account is not creating in the target system database(SQL DB).

Please help me with user provisioning in MSSql Server. Or are there any configurations that I missed?

I really appreciate any help you can provide.