diff --git a/src/aks-preview/azext_aks_preview/managed_cluster_decorator.py b/src/aks-preview/azext_aks_preview/managed_cluster_decorator.py
index 85b7300d505..94898a4896c 100644
--- a/src/aks-preview/azext_aks_preview/managed_cluster_decorator.py
+++ b/src/aks-preview/azext_aks_preview/managed_cluster_decorator.py
@@ -3029,7 +3029,7 @@ def set_up_network_profile(self, mc: ManagedCluster) -> ManagedCluster:
             network_profile.advanced_networking = self.models.AdvancedNetworking(  # pylint: disable=no-member
                 observability=self.models.AdvancedNetworkingObservability(  # pylint: disable=no-member
                     enabled=advanced_network_observability,
-                    tlsManagement=self.context.get_advanced_networking_observability_tls_management(),
+                    tls_management=self.context.get_advanced_networking_observability_tls_management(),
                 )
             )
         return mc