Merge pull request #108416 from RavennMSFT/patch-36

Update hybrid-azuread-join-plan.md

Author: PRMerger9

articles/active-directory/devices/hybrid-azuread-join-plan.md

@@ -54,6 +54,7 @@ Hybrid Azure AD join supports a broad range of Windows devices. Because the conf
 
 - Windows 10
 - Windows Server 2016
+  - **Note**: Azure National cloud customers require version 1809
 - Windows Server 2019
 
 For devices running the Windows desktop operating system, supported version are listed in this article [Windows 10 release information](/windows/release-information/). As a best practice, Microsoft recommends you upgrade to the latest version of Windows 10.