Updated with note on duplicate environment variables

Author: LianaAdaza

articles/container-apps/environment-variables.md

@@ -6,7 +6,7 @@ author: fred-cardoso
 ms.service: azure-container-apps
 ms.custom: devx-track-azurecli, devx-track-azurepowershell
 ms.topic: how-to
-ms.date: 04/10/2024
+ms.date: 09/13/2024
 ms.author: fredcardoso
 ---
 
@@ -19,6 +19,9 @@ These environment variables are loaded onto your Container App during runtime.
 
 You can configure the Environment Variables upon the creation of the Container App or later by creating a new revision.
 
+> [!NOTE]
+> To avoid confusion, the duplication of the environment variable are not recommended. When multiple environment variables have the same name, the last position of the list takes effect.
+
 ### [Azure portal](#tab/portal)
 
 If you're creating a new Container App through the [Azure portal](https://portal.azure.com), you can set up the environment variables on the Container section: