diff --git a/src/StarfaceOutlookSync/Services/StarfaceApiClient.cs b/src/StarfaceOutlookSync/Services/StarfaceApiClient.cs
index 6a31665e..8d1e27dd 100644
--- a/src/StarfaceOutlookSync/Services/StarfaceApiClient.cs
+++ b/src/StarfaceOutlookSync/Services/StarfaceApiClient.cs
@@ -155,11 +155,14 @@ namespace StarfaceOutlookSync.Services
             return books;
         }
 
+        public event Action<string> OnDebug;
+
         public async Task<List<UnifiedContact>> GetContactsAsync(StarfaceAddressBook book)
         {
             var contacts = new List<UnifiedContact>();
             int page = 0;
             const int pageSize = 200;
+            bool firstPage = true;
 
             while (true)
             {
@@ -206,6 +209,13 @@ namespace StarfaceOutlookSync.Services
 
                 if (array.Count == 0) break;
 
+                // Ersten Kontakt als Debug-Info loggen
+                if (firstPage && array.Count > 0)
+                {
+                    OnDebug?.Invoke($"Starface API Rohdaten (1. Kontakt):\n{array[0].ToString(Formatting.Indented)}");
+                    firstPage = false;
+                }
+
                 foreach (var item in array)
                     contacts.Add(MapFromStarface(item));
 
diff --git a/src/StarfaceOutlookSync/Services/SyncEngine.cs b/src/StarfaceOutlookSync/Services/SyncEngine.cs
index 1fb2b332..1ddc4bc0 100644
--- a/src/StarfaceOutlookSync/Services/SyncEngine.cs
+++ b/src/StarfaceOutlookSync/Services/SyncEngine.cs
@@ -53,6 +53,7 @@ namespace StarfaceOutlookSync.Services
                 Log("Verbinde mit Starface...");
                 using (var starface = new StarfaceApiClient(profile.StarfaceConnection))
                 {
+                    starface.OnDebug += (msg) => Log(msg);
                     var loginOk = await starface.LoginAsync();
                     if (!loginOk)
                     {