diff --git a/feathr_project/feathr/client.py b/feathr_project/feathr/client.py
index bb78f7f74..23e7e6691 100644
--- a/feathr_project/feathr/client.py
+++ b/feathr_project/feathr/client.py
@@ -188,6 +188,7 @@ def __init__(self, config_path:str = "./feathr_config.yaml", local_workspace_dir
             registry_delimiter = self.envutils.get_environment_variable_with_default('feature_registry', 'purview', 'delimiter')
             # initialize the registry no matter whether we set purview name or not, given some of the methods are used there.
             self.registry = _PurviewRegistry(self.project_name, azure_purview_name, registry_delimiter, project_registry_tag, config_path = config_path, credential=credential)
+            logger.warning("FEATURE_REGISTRY__PURVIEW__PURVIEW_NAME will be deprecated soon. Please use FEATURE_REGISTRY__API_ENDPOINT instead.")
         else:
             # no registry configured
             logger.info("Feathr registry is not configured. Consider setting the Feathr registry component for richer feature store experience.")
diff --git a/feathr_project/test/test_feature_registry.py b/feathr_project/test/test_feature_registry.py
index 86db93440..9fe66322a 100644
--- a/feathr_project/test/test_feature_registry.py
+++ b/feathr_project/test/test_feature_registry.py
@@ -14,7 +14,7 @@
 from feathr.registry._feathr_registry_client import _FeatureRegistry
 from feathrcli.cli import init
 from test_fixture import registry_test_setup
-from test_fixture import registry_test_setup_append, registry_test_setup_partially
+from test_fixture import registry_test_setup_append, registry_test_setup_partially, registry_test_setup_for_409
 from test_utils.constants import Constants
 
 class FeatureRegistryTests(unittest.TestCase):
@@ -58,6 +58,15 @@ def test_feathr_register_features_e2e(self):
 
                 # Sync workspace from registry, will get all conf files back
                 client.get_features_from_registry(client.project_name)
+                
+                # Register the same feature with different definition and expect an error.
+                client: FeathrClient = registry_test_setup_for_409(os.path.join(test_workspace_dir, config_path), client.project_name)
+
+                with pytest.raises(RuntimeError) as exc_info:
+                    client.register_features()
+                
+                # <ExceptionInfo RuntimeError('Failed to call registry API, status is 409, error is {"message":"Entity feathr_ci_registry_53_3_476999__request_features__f_is_long_trip_distance already exists"}')
+            assert "status is 409" in str(exc_info.value)
 
     def test_feathr_register_features_partially(self):
         """
diff --git a/feathr_project/test/test_fixture.py b/feathr_project/test/test_fixture.py
index 79a76657c..d6d8941c9 100644
--- a/feathr_project/test/test_fixture.py
+++ b/feathr_project/test/test_fixture.py
@@ -184,18 +184,6 @@ def registry_test_setup_partially(config_path: str):
     client.build_features(anchor_list=[agg_anchor, request_anchor], derived_feature_list=derived_feature_list)
     return client
 
-def registry_test_setup_append(config_path: str):
-    """Append features to a project. Will call `generate_entities()` and register from the 2nd anchor feature
-    """
-
-    client = FeathrClient(config_path=config_path, project_registry_tag={"for_test_purpose":"true"})
-
-    request_anchor, agg_anchor, derived_feature_list = generate_entities()
-    agg_anchor.features = agg_anchor.features[1:]
-    client.build_features(anchor_list=[agg_anchor, request_anchor], derived_feature_list=derived_feature_list)
-    return client
-
-
 def generate_entities():
     def add_new_dropoff_and_fare_amount_column(df: DataFrame):
         from pyspark.sql.functions import col
@@ -375,6 +363,29 @@ def add_new_dropoff_and_fare_amount_column(df: DataFrame):
     client.build_features(anchor_list=[agg_anchor, request_anchor], derived_feature_list=derived_feature_list)
     return client
 
+def registry_test_setup_for_409(config_path: str, project_name: str):
+    now = datetime.now()
+    os.environ["project_config__project_name"] =  project_name
+
+    client = FeathrClient(config_path=config_path, project_registry_tag={"for_test_purpose":"true"})
+
+    # tranform in other sample is cast_float(trip_distance)>30
+    # update this to trigger 409 conflict with the existing one
+    features = [
+        Feature(name="f_is_long_trip_distance",
+                feature_type=BOOLEAN,
+                transform="cast_float(trip_distance)>10"),
+    ]
+
+    request_anchor = FeatureAnchor(name="request_features",
+                                   source=INPUT_CONTEXT,
+                                   features=features,
+                                   registry_tags={"for_test_purpose":"true"}
+                                   )
+
+    client.build_features(anchor_list=[request_anchor])
+    return client
+
 def get_online_test_table_name(table_name: str):
     # use different time for testing to avoid write conflicts
     now = datetime.now()