Fixes after review

src/Infinity.Toolkit.Azure/Configuration/ConfigurationBuilderExtensions.cs

@@ -125,10 +125,11 @@ public static IHostApplicationBuilder ConfigureAzureAppConfiguration(this IHostA
                     if (!Uri.TryCreate(envEndpoint, UriKind.Absolute, out endpointUri))
                     {
                         throw new InvalidOperationException($"""
-                            ConnectionString is missing.
-                            It should be provided in 'ConnectionStrings:AzureAppConfig'
-                            or '{configSectionName}:Endpoint' key
-                            configuration section or 'AZURE_APP_CONFIG_ENDPOINT' environment variable.
+                        Unable to find a valid Azure App Configuration endpoint.
+                        Please provide a valid endpoint using one of the following sources:
+                        - 'ConnectionStrings:AzureAppConfig' (connection string)
+                        - '${configSectionName}:Endpoint' configuration section
+                        - 'AZURE_APP_CONFIG_ENDPOINT' environment variable
                         """);
                     }
                 }

src/Infinity.Toolkit.Azure/EnvironmentHelper.cs

@@ -4,7 +4,7 @@ internal static class EnvironmentHelper
 {
     public static bool IsRunningInContainer => Equals(Environment.GetEnvironmentVariable("DOTNET_RUNNING_IN_CONTAINER"), "true");
 
-    public static bool IsRunningInAzureAppService => Equals(Environment.GetEnvironmentVariable("WEBSITE_SITE_NAME"), "true");
+    public static bool IsRunningInAzureAppService => !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("WEBSITE_SITE_NAME"));
 
     public static bool IsRunningInAzureContainerApps => IsRunningInContainer && !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("CONTAINER_APP_NAME"));
 

src/Infinity.Toolkit.Azure/Identity/TokenCredentialHelper.cs

@@ -31,9 +31,13 @@ public static TokenCredential GetTokenCredential(string? clientId = null)
         // First check if the app is running in Azure
         if (EnvironmentHelper.IsRunningInAzure)
         {
+            var userAssignedClientId = clientId ?? Environment.GetEnvironmentVariable("AZURE_CLIENT_ID");
             tokenCredentials = [
                 new EnvironmentCredential(),
-                new ManagedIdentityCredential(ManagedIdentityId.FromUserAssignedClientId(clientId ?? Environment.GetEnvironmentVariable("AZURE_CLIENT_ID") ?? string.Empty))];
+                string.IsNullOrWhiteSpace(userAssignedClientId)
+                    ? new ManagedIdentityCredential()
+                    : new ManagedIdentityCredential(ManagedIdentityId.FromUserAssignedClientId(userAssignedClientId))
+            ];
 
             var tokenCredential = new ChainedTokenCredential(tokenCredentials);
             return tokenCredential;

src/Infinity.Toolkit.FeatureModules/WebApplicationBuilderExtensions.cs

@@ -97,12 +97,6 @@ private static void RegisterModules(IEnumerable<TypeInfo> discoveredModules, IHo
 
         foreach (var module in modules)
         {
-            if (registeredFeatureModules.ContainsKey(module.GetType()))
-            {
-                logger?.LogWarning(new EventId(1001, "RegisteringModules"), "Module {module} is already registered. Skipping duplicate registration.", module.GetType().FullName);
-                continue;
-            }
-
             registeredFeatureModules.Add(module.GetType(), module);
 
             if (module is IWebFeatureModule webModule)