SCIM templates are created only for provisioning, not single sign-on. The details that are present under Sign On tab are purely for placeholder.
If you have a production tenant and/or you are able to create SAML 2.0 application from the Application Integration Wizard (switch from Developer Console to Classic UI in admin panel >> Applications >> Add Application >> Create New App >> Sign On method >> SAML 2.0), then please send an email to support@okta.com to request SCIM_PROVISIONING feature. This feature will give you the possibility to add provisioning to the SAML applications through SCIM 2.0.