Adding Customers now works.

WD7UVN_SzTGUI_2023242.Client.WPF/ViewModels/GetColleaguesViewModel.cs

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+using WD7UVN_HFT_2023241.Models;
+using System.ComponentModel;
+using System.Windows;
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace WD7UVN_SzTGUI_2023242.Client.WPF.ViewModels
+{
+    public class GetColleaguesViewModel : ObservableRecipient
+    {
+        public RestCollection<Employee> Employees { get; set; }
+
+        public static bool IsInDesignMode
+        {
+            get
+            {
+                var prop = DesignerProperties.IsInDesignModeProperty;
+                return (bool)DependencyPropertyDescriptor.FromProperty(prop, typeof(FrameworkElement)).Metadata.DefaultValue;
+            }
+        }
+
+        public GetColleaguesViewModel(MaintainerTeam e)
+        {
+            if (!IsInDesignMode)
+            {
+                Employees = new RestCollection<Employee>("http://localhost:5000/", "api/WhoWorksInMaintainerTeam?id=" + e.ID.ToString(), "hub", true);
+            }
+        }
+    }
+}