I tested in my local sandbox by giving these same 2 Capabilities to an identity, and I can query the SCIM APIs just fine (I tested with GET http://localhost:8080/identityiq_82/scim/v2/Users). It seems like the endpoint you are calling is not valid: https://:8443/identityiq/scim/v2/list
Check the list of valid IdentityIQ API endpoints: IdentityIQ API | SailPoint Developer Community