Keycloak quickstarts do not work with RH-SSO 7.2.4 out of the box.
At first, the quickstarts are designed for Keycloak instead of RH-SSO. The only issue here is that the quickstarts use realm from keycloak-4.x but RH-SSO 7.2.4 contains keycloak-3.4.x.
Note that all needed logic was backported from keycloack-4.x to keycloak-3.4.x. Only the realm s are different.