not on availability

Author: EdB-MSFT

articles/sentinel/geographical-availability-data-residency.md

@@ -65,6 +65,10 @@ Regions supported for Microsoft Sentinel raw data, and for processed and configu
 
 ### Regions supported for Microsoft Sentinel data lake
 
+> [!NOTE]
+> The Microsoft Sentinel data lake is currently in preview. During this time onboarding may be temporarily unavailable in some regions. When onboarding is available in your region, a onboarding banner appears on the Microsoft Defender portal home page to guide you through the process.
+
+
 | Continent              | Country/Region   | Azure Region                          |
 |------------------------|------------------|---------------------------------------|
 | North America          | Canada           | Canada Central                        |