Прокинул FedbackService в DI.

PhoneStore/Helpers/ServiceConnector.cs

@@ -23,6 +23,7 @@ namespace PhoneStore.Helpers
             services.AddTransient<IPaginationService<User>, PaginationService<User>>();
             services.AddTransient<IAccountService, AccountService>();
             services.AddTransient<IUsersSearcher, UsersSearcher>();
+            services.AddTransient<IFeedbackService, FeedbackService>();
         }
     }
 }
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