diff --git a/Server/Controllers/ShiftController.cs b/Server/Controllers/ShiftController.cs
index 18f5428..7d750f5 100644
--- a/Server/Controllers/ShiftController.cs
+++ b/Server/Controllers/ShiftController.cs
@@ -7,7 +7,7 @@ namespace ShiftScheduler.Server.Controllers
 {
     [ApiController]
     [Route("api/[controller]")]
-    // [Authorize(Policy = "AllowedEmails")] // Temporarily disabled for testing
+    [Authorize(Policy = "AllowedEmails")]
     public class ShiftController : ControllerBase
     {
         private readonly IcsExportService _icsService;
diff --git a/Shared/TransportModels.cs b/Shared/TransportModels.cs
index d0b1c8b..311a684 100644
--- a/Shared/TransportModels.cs
+++ b/Shared/TransportModels.cs
@@ -17,7 +17,7 @@ namespace ShiftScheduler.Shared
         public string DepartureTime { get; set; } = string.Empty;
         public string ArrivalTime { get; set; } = string.Empty;
         public string Duration { get; set; } = string.Empty;
-        public string Platform { get; set; } = string.Empty;
+        public string? Platform { get; set; } = string.Empty;
         public List<TransportSection> Sections { get; set; } = new();
     }
 
@@ -38,9 +38,9 @@ namespace ShiftScheduler.Shared
     public class TransportCheckpoint
     {
         public TransportStation? Station { get; set; }
-        public string Departure { get; set; } = string.Empty;
-        public string Arrival { get; set; } = string.Empty;
-        public string Platform { get; set; } = string.Empty;
+        public string? Departure { get; set; } = string.Empty;
+        public string? Arrival { get; set; } = string.Empty;
+        public string? Platform { get; set; } = string.Empty;
     }
 
     public class TransportStation