Final answer:
To receive notifications about maintenance that can affect resources in an Azure Subscription, you should use Azure Service Health. This service specifically provides alerts and guidance regarding health issues that may impact your resources.
Step-by-step explanation:
If you need to be notified when Microsoft plans to perform maintenance that can affect the resources deployed to an Azure Subscription, you should use Azure Service Health. This service provides a personalized view of the health of the Azure services, regions, and resources you rely on. Azure Service Health alerts you with notifications if there's Azure service issues that affect you, and it provides guidance and support when issues in Azure services affect your resources.
Azure Advisor is a personalized cloud consultant that helps you follow best practices to optimize your Azure deployments. Azure Monitor maximizes the availability and performance of your applications by delivering a comprehensive solution for collecting, analyzing, and acting on telemetry from your cloud and on-premises environments. Azure Policy implements governance for resource consistency, regulatory compliance, security, cost, and management. However, for maintenance notifications, Azure Service Health is the correct service to use.