chore: enable subdomain test

.github/integ-config/integ-all.yml

@@ -521,6 +521,13 @@ tests:
     sample_name: [sign-in-with-oauth]
     spec: sign-out-oidc-provider
     browser: [chrome]
+  - test_name: subdomain_authentication
+    desc: 'Sign-in with the OAuth flow and subdomains'
+    framework: next
+    category: auth
+    sample_name: [subdomains]
+    spec: subdomains
+    browser: [chrome]
 
   # AUTH GEN2
   - test_name: integ_react_javascript_authentication_gen2