Update articles/aks/egress-outboundtype.md

Co-authored-by: Chase Wilson <[email protected]>

Author: joharder

articles/aks/egress-outboundtype.md

@@ -101,6 +101,9 @@ Migration is only supported between `loadBalancer`, `managedNATGateway` (if usin
 
 ### Update cluster to use a new outbound type
 
+> [!NOTE]
+> You must have use >= 2.56 of Azure CLI to migrate outbound type. Use `az upgrade` to update to the latest version of Azure CLI. 
+
 * Update the outbound configuration of your cluster using the [`az aks update`][az-aks-update] command.
 
 ### Update cluster from loadbalancer to managedNATGateway