"OSP for IDM" supports multiple external IDPs/identity services for SSO/federation as described in the documentation:
https://www.netiq.com/documentation/identity-manager-48/identity_apps_admin/data/configure-single-sign-on-access.html

According to support, such OSP setups are not currently supported for IDC integration. This means that only the standard LDAP-based username/password setup is supported for IDC OSP integration.
This makes it pretty much useless for SSO/federation/modern authentication scenarios. And you would have to set up additional/dedicated OSP instances for IDC only, or revert to basic ldap login for IDC, which is currently a nightmare.

So please get the tools properly integrated with OSP so that they can be used via seamless SSO that is expected of modern and secure web applications.

Best regards,
Philipp