Solved bug existed due to difference between mailu domain and hostname difference. also refactored during this to find the bug

roles/sys-srv-web-inj-logout/templates/logout_one_liner.js.j2

@@ -1,6 +1,6 @@
 document.addEventListener('DOMContentLoaded', function() {
     initLogoutPatch(
-        '{{ oidc.client.logout_url }}',
+        '{{ OIDC.CLIENT.LOGOUT_URL }}',
         '{{ WEB_PROTOCOL }}',
         '{{ PRIMARY_DOMAIN }}'
     );