in src/main/java/com/epam/digital/data/platform/integration/idm/service/KeycloakIdmService.java [114:118]
public void saveUserAttribute(String username, String attribute, List<String> values) {
var realmResource = client.getRealmResource();
var user = client.getUsersRepresentationByUsername(realmResource, username);
client.saveUserAttribute(realmResource, user.get(0).getId(), attribute, values);
}