It works: client service + server service + utility service to know server uri when app is running

App.Services/AuthService/IAuthService.cs

@@ -0,0 +1,11 @@
+using Sandbox.Models.ViewModels;
+
+namespace Sandbox.App.Services.AuthService;
+
+public interface IAuthService
+{
+    Task<ServiceResponse<int>> Register(UserRegister request);
+    // Task<ServiceResponse<string>> Login(UserLogin request);
+    // Task<ServiceResponse<bool>> ChangePassword(UserChangePassword request);
+    // Task<bool> IsUserAuthenticated();
+}