note about connection strings

Author: aahill

articles/ai-foundry/agents/includes/endpoint-string-portal.md

@@ -9,4 +9,11 @@ ms.date: 12/11/2024
 
 You can find your endpoint in the **overview** for your project in the [Azure AI Foundry portal](https://ai.azure.com/?cid=learnDocs), under **Libraries** > **Azure AI Foundry**.
 
+> [!IMPORTANT]
+> Starting in May 2025, the Azure AI Agent Service uses an endpoint for [Foundry projects](../../what-is-azure-ai-foundry.md#project-types) instead of the connection string that were used for hub-based projects before this time. Connection strings are no longer supported in current versions of the SDKs and REST API. We recommend creating a new foundry project.
+>
+> If you want to continue using your hub-based project and connection string, you will need to use one of the previous versions of the SDK:
+> * C#: `1.0.0-beta.2` or earlier
+> * Python: `1.0.0b10` or earlier
+
 :::image type="content" source="../media/quickstart/portal-endpoint-string.png" alt-text="A screenshot showing the endpoint in the Azure AI Foundry portal." lightbox="../media/quickstart/portal-endpoint-string.png":::