diff --git a/setup.cfg b/setup.cfg
index b2164fff..b7477e06 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -53,7 +53,7 @@ install_requires =
     # And we will use the cryptography (X+3).0.0 as the upper bound,
     # based on their latest deprecation policy
     # https://cryptography.io/en/latest/api-stability/#deprecation
-    cryptography>=2.5,<50
+    cryptography>=2.5,<51
 
 
 [options.extras_require]
diff --git a/tests/lab_config.py b/tests/lab_config.py
index 8b692e3f..6f048357 100644
--- a/tests/lab_config.py
+++ b/tests/lab_config.py
@@ -95,6 +95,7 @@ class AppSecrets:
     B2C_CLIENT = "MSAL-App-B2C-JSON"
     CIAM_CLIENT = "MSAL-App-CIAM-JSON"
     ARLINGTON_CLIENT = "MSAL-App-Arlington-JSON"
+    OBO_CLIENT_SECRET = "IdentityDivisionDotNetOBOServiceSecret"
 
 # =============================================================================
 # Data Classes
diff --git a/tests/test_e2e.py b/tests/test_e2e.py
index 37632ee7..e6cb999a 100644
--- a/tests/test_e2e.py
+++ b/tests/test_e2e.py
@@ -902,31 +902,28 @@ def test_acquire_token_obo(self):
         """Test On-Behalf-Of flow.
         
         Flow:
-        1. PCA acquires token for user to access the WebAPI (scope: api://<app_id>/access_as_user)
-        2. WebAPI (CCA) uses that token as assertion to get token for downstream service (Graph)
+        1. S2S app (PCA) acquires token for user, targeting the WebAPI
+        2. WebAPI (CCA) uses that token as assertion to get token for downstream (Graph)
         """
         user = get_user_config(UserSecrets.PUBLIC_CLOUD)
         password = get_user_password(user)
+        s2s_app = get_app_config(AppSecrets.S2S_CLIENT)
         web_api_app = get_app_config(AppSecrets.WEB_API_CLIENT)
 
-        # Step 1: PCA gets token for user to access the WebAPI
-        # Note: Java test uses "organizations" authority for PCA
         config_pca = {
-            "authority": "https://login.microsoftonline.com/organizations",
-            "client_id": web_api_app.app_id,
+            "authority": user.authority,
+            "client_id": s2s_app.app_id,
             "username": user.upn,
             "password": password,
-            "scope": ["api://%s/access_as_user" % web_api_app.app_id],
+            "scope": [web_api_app.defaultscopes],
         }
 
-        # Step 2: WebAPI (CCA) exchanges the token via OBO for Graph access
-        # Note: web_api_app.client_secret contains the Key Vault secret name,
-        # which we pass to get_secret() to retrieve the actual secret value.
         config_cca = {
-            "authority": user.authority,  # Tenant-specific authority
+            "authority": user.authority,
             "client_id": web_api_app.app_id,
-            "client_secret": get_secret(web_api_app.client_secret, vault="msal_team"),
-            "scope": ["https://graph.microsoft.com/.default"],
+            "client_secret": get_secret(
+                AppSecrets.OBO_CLIENT_SECRET, vault="msal_team"),
+            "scope": ["User.Read"],
             "username": user.upn,
         }
 
@@ -1243,23 +1240,23 @@ def test_cca_obo_should_bypass_regional_endpoint_therefore_still_work(self):
         """
         user = get_user_config(UserSecrets.PUBLIC_CLOUD)
         password = get_user_password(user)
+        s2s_app = get_app_config(AppSecrets.S2S_CLIENT)
         web_api_app = get_app_config(AppSecrets.WEB_API_CLIENT)
 
-        # Step 1: PCA gets token for user to access the WebAPI
         config_pca = {
-            "authority": "https://login.microsoftonline.com/organizations",
-            "client_id": web_api_app.app_id,
+            "authority": user.authority,
+            "client_id": s2s_app.app_id,
             "username": user.upn,
             "password": password,
-            "scope": ["api://%s/access_as_user" % web_api_app.app_id],
+            "scope": [web_api_app.defaultscopes],
         }
 
-        # Step 2: WebAPI (CCA) exchanges the token via OBO for Graph access
         config_cca = {
             "authority": user.authority,
             "client_id": web_api_app.app_id,
-            "client_secret": get_secret(web_api_app.client_secret, vault="msal_team"),
-            "scope": ["https://graph.microsoft.com/.default"],
+            "client_secret": get_secret(
+                AppSecrets.OBO_CLIENT_SECRET, vault="msal_team"),
+            "scope": ["User.Read"],
             "username": user.upn,
         }