diff --git a/services/TS29222_CAPIF_Events_API/capif_events/core/events_apis.py b/services/TS29222_CAPIF_Events_API/capif_events/core/events_apis.py
index 33620c848f2b83cdcad81c253c67579c9c20ed2e..f0226d0fa230277081026b98d547ce7742c684c6 100644
--- a/services/TS29222_CAPIF_Events_API/capif_events/core/events_apis.py
+++ b/services/TS29222_CAPIF_Events_API/capif_events/core/events_apis.py
@@ -56,8 +56,8 @@ class EventSubscriptionsOperations(Resource):
 
             if event_subscription.supported_features is None:
                 return bad_request_error(
-                    detail="supportedFeatures must be present in this request",
-                    cause="supportedFeatures missed",
+                    detail="supportedFeatures not present in request",
+                    cause="supportedFeatures not present",
                     invalid_params=[{"param": "supportedFeatures", "reason": "not defined"}]
                 )
 
@@ -132,12 +132,12 @@ class EventSubscriptionsOperations(Resource):
 
             current_app.logger.debug("Updating event subscription")
             
-            # if event_subscription.supported_features is None:
-            #     return bad_request_error(
-            #         detail="supportedFeatures must be present in this request",
-            #         cause="supportedFeatures missed",
-            #         invalid_params=[{"param": "supportedFeatures", "reason": "not defined"}]
-            #     )
+            if event_subscription.supported_features is None:
+                return bad_request_error(
+                    detail="supportedFeatures not present in request",
+                    cause="supportedFeatures not present",
+                    invalid_params=[{"param": "supportedFeatures", "reason": "not defined"}]
+                )
 
             result = self.__check_subscriber_id(subscriber_id)