adding GCC high exclusion

Author: Brenduns

memdocs/intune/protect/includes/security-config-mgt-prerequisites.md

@@ -9,7 +9,10 @@ ms.topic: include
 ---
 ## Prerequisites
 
-Review the following sections for requirements for the Security Management for Microsoft Defender for Endpoint Scenario:
+Review the following sections for requirements for the Security Management for Microsoft Defender for Endpoint Scenario.
+
+> [!IMPORTANT]
+> This feature is not supported on GCC High environments.
 
 ### Environment