Merge pull request #233653 from halkazwini/rs-preference2

Add a note

Author: JamesJBarnett

articles/route-server/routing-preference.md

@@ -6,8 +6,8 @@ author: halkazwini
 ms.author: halkazwini
 ms.service: route-server
 ms.topic: conceptual
-ms.date: 03/28/2023
-ms.custom: template-concept
+ms.date: 04/06/2023
+ms.custom: template-concept, engagement-fy23
 ---
 
 # Azure Route Server routing preference
@@ -16,6 +16,9 @@ Azure Route Server enables dynamic routing between network virtual appliances (N
 
 When **branch-to-branch** is enabled and Route Server learns multiple routes across site-to-site (S2S) VPN, ExpressRoute and SD-WAN NVAs, for the same on-premises destination route prefix, users can now configure connection preferences to influence Route Server route selection.
 
+> [!IMPORTANT]
+> Routing preference is only available for Route Servers deployed on or after April 7, 2023. Support for existing Route Servers, deployed before April 7, 2023, will be backfilled at a later date. For any questions, please open [a support request in the Azure Portal](https://aka.ms/azsupt).
+
 ## Routing preference configuration
 
 When Route Server has multiple routes to an on-premises destination prefix, Route Server selects the best route(s) in order of preference, as follows:
@@ -32,4 +35,4 @@ When Route Server has multiple routes to an on-premises destination prefix, Rout
 ## Next steps
 
 - Learn how to [configure Azure Route Server](quickstart-configure-route-server-portal.md).
-- Learn how to [monitor Azure Route Server](monitor-route-server.md).
+- Learn how to [monitor Azure Route Server](monitor-route-server.md).