New User should be disabled in keycloak by default and should not be able to generate an access token.
On approval, user should be enabled in keycloak and should be able to authenticate successfully to keycloak and should be able to generate an access token.
On new user signup, by default, the user should be disabled in keycloak. (https://github.com/JJCSA/backend/blob/479621e55120f84a40f92adf51fe0ac92bfdb532/src/main/java/com/jjcsa/util/KeycloakUtil.java#L79) Once admin approves, the user should be enabled in keycloak.
Acceptance Criteria: