Add note for CSP subscriptions

Author: hazemelh

articles/ai-studio/how-to/model-catalog-overview.md

@@ -147,6 +147,9 @@ Learn more about data processing for MaaS in the [article about data privacy](co
 
 :::image type="content" source="../media/explore/model-publisher-cycle.png" alt-text="Diagram that shows the model publisher service cycle." lightbox="../media/explore/model-publisher-cycle.png":::
 
+> [!NOTE]
+> CSP subscriptions do not have the ability to purchase serverless API deployments (MaaS) for third-party models.
+
 ### Billing
 
 The discovery, subscription, and consumption experience for models deployed via MaaS is in Azure AI Foundry portal and Azure Machine Learning studio. Users accept license terms for use of the models. Pricing information for consumption is provided during deployment.