diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2022-07-02-preview/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2022-07-02-preview/managedClusters.json
index f9c63c584b65..df9dbed32619 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2022-07-02-preview/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2022-07-02-preview/managedClusters.json
@@ -1238,6 +1238,12 @@
             "schema": {
               "$ref": "#/definitions/AgentPoolAvailableVersions"
             }
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "#/definitions/CloudError"
+            }
           }
         },
         "x-ms-examples": {