fix issue

src/BuildingBlocks/EventBus/EventBusServiceBus/DefaultServiceBusPersisterConnection.cs

@@ -35,6 +35,7 @@ namespace Microsoft.eShopOnContainers.BuildingBlocks.EventBusServiceBus
         {
             get
             {
+                _subscriptionClient = new ServiceBusAdministrationClient("Endpoint=sb://eshopsbahsjtib3he5fg.servicebus.windows.net/;SharedAccessKeyName=Root;SharedAccessKey=2PJt+7/85C1gN6Xx+Cjn+UprCmDvwjJ9hDZ42GQRYLE=;EntityPath=eshop_event_bus");
                 return _subscriptionClient;
             }
         }

src/BuildingBlocks/EventBus/EventBusServiceBus/EventBusServiceBus.cs

@@ -35,9 +35,10 @@ namespace Microsoft.eShopOnContainers.BuildingBlocks.EventBusServiceBus
             _subscriptionName = subscriptionClientName;
             _sender = _serviceBusPersisterConnection.TopicClient.CreateSender(_topicName);
             ServiceBusProcessorOptions options = new ServiceBusProcessorOptions { MaxConcurrentCalls = 10, AutoCompleteMessages = false };
-            _processor = _serviceBusPersisterConnection.TopicClient.CreateProcessor(_topicName, options);
+            _processor = _serviceBusPersisterConnection.TopicClient.CreateProcessor(_topicName, _subscriptionName, options);
 
             RemoveDefaultRule();
+            RegisterSubscriptionClientMessageHandlerAsync().GetAwaiter().GetResult();
         }
 
         public void Publish(IntegrationEvent @event)