Custom/unique subdomain requirement

Author: HeidiSteen

articles/search/cognitive-search-attach-cognitive-services.md

@@ -9,7 +9,7 @@ ms.custom:
   - ignite-2023
   - ignite-2024
 ms.topic: how-to
-ms.date: 11/19/2024
+ms.date: 01/09/2025
 ---
 
 # Attach an Azure AI multi-service resource to a skillset in Azure AI Search
@@ -57,6 +57,8 @@ Using the Azure portal or newer preview REST APIs and beta SDK packages, you can
 
 As with keys, the details you provide about the Azure AI Services resource are used for billing, not connections.  All API requests made by Azure AI Search to Azure AI services for built-in skills processing continue to be internal and managed by Microsoft.
 
+The subdomain URL must include a unique name (for example, `https://hereismyuniquename.cognitiveservices.azure.com`). If the service was created through the Azure portal, a unique subdomain is automatically generated as part of your service setup. Ensure that your service includes a unique subdomain before using it with the Azure AI Search integration.
+
 ### Example: system-assigned managed identity
 
 Identity is set to null.