After setting up Windows Native Authentication, and accessing the WNA-protected page, the browser might give an error indicating that the user name and/or password are incorrect.
The Identity Store used by Oracle Access Management might not point to Windows Active Directory. By default, the identity store is Embedded LDAP.
In the Oracle Access Management Console, review the identity store configuration: System Configuration, Data Sources, User Identity Store.
Confirm the LDAP store settings point to Active Directory.