diff --git a/Jellyfin.Plugin.TubeArchivistMetadata/Configuration/PluginConfiguration.cs b/Jellyfin.Plugin.TubeArchivistMetadata/Configuration/PluginConfiguration.cs
index 18b5f23..e946fba 100644
--- a/Jellyfin.Plugin.TubeArchivistMetadata/Configuration/PluginConfiguration.cs
+++ b/Jellyfin.Plugin.TubeArchivistMetadata/Configuration/PluginConfiguration.cs
@@ -88,6 +88,7 @@ namespace Jellyfin.Plugin.TubeArchivistMetadata.Configuration
             {
                 _tubeArchivistApiKey = value;
                 Plugin.Instance?.LogTAApiConnectionStatus();
+                Plugin.Instance?.UpdateAuthorizationHeader(value);
             }
         }
 
@@ -124,8 +125,20 @@ namespace Jellyfin.Plugin.TubeArchivistMetadata.Configuration
 
             set
             {
-                value.Replace(" ", string.Empty, StringComparison.CurrentCulture).Split(',').ToList().ForEach(u => _jfUsernamesTo.Add(u));
-                _logger.LogDebug("Set JFUsernamesTo to: {Message}", value);
+                // Clear existing usernames
+                _jfUsernamesTo.Clear();
+
+                // Split by comma, then trim each part to remove leading/trailing spaces
+                foreach (var username in value.Split(','))
+                {
+                    var trimmedUsername = username.Trim();
+                    if (!string.IsNullOrEmpty(trimmedUsername))
+                    {
+                        _jfUsernamesTo.Add(trimmedUsername);
+                    }
+                }
+
+                _logger.LogDebug("Set JFUsernamesTo to: {Message}", string.Join(", ", _jfUsernamesTo));
             }
         }
 
diff --git a/Jellyfin.Plugin.TubeArchivistMetadata/Plugin.cs b/Jellyfin.Plugin.TubeArchivistMetadata/Plugin.cs
index 386948b..0f4f0da 100644
--- a/Jellyfin.Plugin.TubeArchivistMetadata/Plugin.cs
+++ b/Jellyfin.Plugin.TubeArchivistMetadata/Plugin.cs
@@ -57,7 +57,8 @@ namespace Jellyfin.Plugin.TubeArchivistMetadata
             handler.AllowAutoRedirect = false;
             handler.CheckCertificateRevocationList = true;
             HttpClient = new HttpClient(handler);
-            HttpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Token", Instance?.Configuration.TubeArchivistApiKey);
+            UpdateAuthorizationHeader(Configuration.TubeArchivistApiKey);
+
             SessionManager = sessionManager;
             sessionManager.PlaybackProgress += OnPlaybackProgress;
             LibraryManager = libraryManager;
@@ -128,6 +129,23 @@ namespace Jellyfin.Plugin.TubeArchivistMetadata
             }
         };
 
+        /// <summary>
+        /// Updates the HTTP client's Authorization header with the current API key.
+        /// </summary>
+        /// <param name="apiKey">TubeArchivist API key.</param>
+        public void UpdateAuthorizationHeader(string apiKey)
+        {
+            if (!string.IsNullOrEmpty(apiKey))
+            {
+                HttpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Token", apiKey);
+                Logger.LogInformation("{Message}", "Updated Authorization header with API key");
+            }
+            else
+            {
+                Logger.LogWarning("{Message}", "No TubeArchivist API key configured");
+            }
+        }
+
         /// <summary>
         /// Logs the TubeArchivist API connection status.
         /// </summary>