diff --git a/allstarr/Controllers/JellyfinController.cs b/allstarr/Controllers/JellyfinController.cs
index 95f74fc..13e2fc8 100644
--- a/allstarr/Controllers/JellyfinController.cs
+++ b/allstarr/Controllers/JellyfinController.cs
@@ -1130,11 +1130,20 @@ public class JellyfinController : ControllerBase
 
     /// <summary>
     /// Marks an item as favorite. For playlists, triggers a full download.
+    /// Supports both /Users/{userId}/FavoriteItems/{itemId} and /UserFavoriteItems/{itemId}?userId=xxx
     /// </summary>
     [HttpPost("Users/{userId}/FavoriteItems/{itemId}")]
-    public async Task<IActionResult> MarkFavorite(string userId, string itemId)
+    [HttpPost("UserFavoriteItems/{itemId}")]
+    public async Task<IActionResult> MarkFavorite(string itemId, string? userId = null)
     {
-        _logger.LogInformation("MarkFavorite called: userId={UserId}, itemId={ItemId}", userId, itemId);
+        // Get userId from query string if not in path
+        if (string.IsNullOrEmpty(userId))
+        {
+            userId = Request.Query["userId"].ToString();
+        }
+        
+        _logger.LogInformation("MarkFavorite called: userId={UserId}, itemId={ItemId}, route={Route}", 
+            userId, itemId, Request.Path);
         
         // Check if this is an external playlist - trigger download
         if (PlaylistIdHelper.IsExternalPlaylist(itemId))
@@ -1195,7 +1204,13 @@ public class JellyfinController : ControllerBase
         }
 
         // For local Jellyfin items, proxy the request through
-        var endpoint = $"Users/{userId}/FavoriteItems/{itemId}";
+        // Use the official Jellyfin endpoint format
+        var endpoint = $"UserFavoriteItems/{itemId}";
+        if (!string.IsNullOrEmpty(userId))
+        {
+            endpoint = $"{endpoint}?userId={userId}";
+        }
+        
         _logger.LogInformation("Proxying favorite request to Jellyfin: {Endpoint}", endpoint);
         
         var result = await _proxyService.PostJsonAsync(endpoint, "{}", Request.Headers);
@@ -1211,11 +1226,20 @@ public class JellyfinController : ControllerBase
 
     /// <summary>
     /// Removes an item from favorites.
+    /// Supports both /Users/{userId}/FavoriteItems/{itemId} and /UserFavoriteItems/{itemId}?userId=xxx
     /// </summary>
     [HttpDelete("Users/{userId}/FavoriteItems/{itemId}")]
-    public async Task<IActionResult> UnmarkFavorite(string userId, string itemId)
+    [HttpDelete("UserFavoriteItems/{itemId}")]
+    public async Task<IActionResult> UnmarkFavorite(string itemId, string? userId = null)
     {
-        _logger.LogInformation("UnmarkFavorite called: userId={UserId}, itemId={ItemId}", userId, itemId);
+        // Get userId from query string if not in path
+        if (string.IsNullOrEmpty(userId))
+        {
+            userId = Request.Query["userId"].ToString();
+        }
+        
+        _logger.LogInformation("UnmarkFavorite called: userId={UserId}, itemId={ItemId}, route={Route}", 
+            userId, itemId, Request.Path);
         
         // External items can't be unfavorited (they're not really favorited in Jellyfin)
         var (isExternal, _, _) = _localLibraryService.ParseSongId(itemId);
@@ -1230,7 +1254,13 @@ public class JellyfinController : ControllerBase
         }
 
         // Proxy to Jellyfin to unfavorite
-        var endpoint = $"Users/{userId}/FavoriteItems/{itemId}";
+        // Use the official Jellyfin endpoint format
+        var endpoint = $"UserFavoriteItems/{itemId}";
+        if (!string.IsNullOrEmpty(userId))
+        {
+            endpoint = $"{endpoint}?userId={userId}";
+        }
+        
         _logger.LogInformation("Proxying unfavorite request to Jellyfin: {Endpoint}", endpoint);
         
         var result = await _proxyService.DeleteAsync(endpoint, Request.Headers);