[keycloak-user] Unable to Add Role Mappings Via REST API in 1.5.1

Hi, I'm having issues migrating my application from keycloak 1.2.1.Final to 1.5.1.Final. I already had working code that enables us to create users and assign role mappings to those users via the REST api. However, whiles testing the application for migrating to 1.5.1, I get a 404 when application attempts to add rolemappings to users via the REST api. The REST invocation to create the user actually works, its the subsequent invocation to add role-mappings that fails with the 404. Do you have any idea what has changed?