Добавьте файлы проекта.

Services/Tickets/Extentions/ServiceCollectionExtentions.cs

@@ -0,0 +1,14 @@
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+using Services.Numbers.Extentions;
+
+namespace Services.Tickets.Extentions;
+
+public static class ServiceCollectionExtentions
+{
+    public static void TyAddTicketService(this IServiceCollection services)
+    {
+        services.TyAddNumbersService();
+        services.TryAddScoped<ITicketService, TicketService>();
+    }
+}