diff --git a/src/python/grpcio_tests/tests_py3_only/interop/xds_interop_client.py b/src/python/grpcio_tests/tests_py3_only/interop/xds_interop_client.py
index 99c760b5662..c846576765c 100644
--- a/src/python/grpcio_tests/tests_py3_only/interop/xds_interop_client.py
+++ b/src/python/grpcio_tests/tests_py3_only/interop/xds_interop_client.py
@@ -44,6 +44,11 @@ _SUPPORTED_METHODS = (
     "EmptyCall",
 )
 
+_METHOD_CAMEL_TO_CAPS_SNAKE = {
+    "UnaryCall": "UNARY_CALL",
+    "EmptyCall": "EMPTY_CALL",
+}
+
 _METHOD_STR_TO_ENUM = {
     "UnaryCall": messages_pb2.ClientConfigureRequest.UNARY_CALL,
     "EmptyCall": messages_pb2.ClientConfigureRequest.EMPTY_CALL,
@@ -147,10 +152,11 @@ class _LoadBalancerStatsServicer(test_pb2_grpc.LoadBalancerStatsServiceServicer
         response = messages_pb2.LoadBalancerAccumulatedStatsResponse()
         with _global_lock:
             for method in _SUPPORTED_METHODS:
-                response.num_rpcs_started_by_method[method] = _global_rpcs_started.get[method]
-                response.num_rpcs_succeeded_by_method[method] = _global_rpcs_succeeded.get[method]
-                response.num_rpcs_failed_by_method[method] = _global_rpcs_succeeded.get[method]
-        logger.info("Returning cumulative stats request.")
+                caps_method = _METHOD_CAMEL_TO_CAPS_SNAKE[method]
+                response.num_rpcs_started_by_method[caps_method] = _global_rpcs_started[method]
+                response.num_rpcs_succeeded_by_method[caps_method] = _global_rpcs_succeeded[method]
+                response.num_rpcs_failed_by_method[caps_method] = _global_rpcs_failed[method]
+        logger.info("Returning cumulative stats response.")
         return response
 
 
@@ -184,8 +190,6 @@ def _on_rpc_done(rpc_id: int, future: grpc.Future, method: str,
         else:
             logger.error(exception)
     else:
-        with _global_lock:
-            _global_rpcs_succeeded[method] += 1
         response = future.result()
         hostname = None
         for metadatum in future.initial_metadata():
@@ -194,6 +198,12 @@ def _on_rpc_done(rpc_id: int, future: grpc.Future, method: str,
                 break
         else:
             hostname = response.hostname
+        if future.code() == grpc.StatusCode.OK:
+            with _global_lock:
+                _global_rpcs_succeeded[method] += 1
+        else:
+            with _global_lock:
+                _global_rpcs_failed[method] += 1
         if print_response:
             if future.code() == grpc.StatusCode.OK:
                 logger.info("Successful response.")
@@ -284,6 +294,7 @@ class _XdsUpdateClientConfigureServicer(test_pb2_grpc.XdsUpdateClientConfigureSe
 
     def Configure(self, request: messages_pb2.ClientConfigureRequest,
             context: grpc.ServicerContext) -> messages_pb2.ClientConfigureResponse:
+        logging.info("Received Configure RPC: {}".format(request))
         method_strs = (_METHOD_ENUM_TO_STR[t] for t in request.types)
         for method in _SUPPORTED_METHODS:
             method_enum = _METHOD_STR_TO_ENUM[method]
@@ -293,10 +304,10 @@ class _XdsUpdateClientConfigureServicer(test_pb2_grpc.XdsUpdateClientConfigureSe
             else:
                 qps = 0
                 metadata = ()
-            channel_config = self._per_method_config[method]
+            channel_config = self._per_method_configs[method]
             with channel_config.condition:
                 channel_config.qps = qps
-                channel_config.metadata = metadata
+                channel_config.metadata = list(metadata)
                 channel_config.condition.notify_all()
         # TODO: Wait for all channels to respond until responding to RPC?
         return messages_pb2.ClientConfigureResponse()