diff --git a/schemas/2022-01-01-preview/Microsoft.App.json b/schemas/2022-01-01-preview/Microsoft.App.json
index 3427e6060c..d516dd1519 100644
--- a/schemas/2022-01-01-preview/Microsoft.App.json
+++ b/schemas/2022-01-01-preview/Microsoft.App.json
@@ -1350,6 +1350,10 @@
           "description": "Hostname."
         }
       },
+      "required": [
+        "certificateId",
+        "name"
+      ],
       "description": "Custom Domain of a Container App"
     },
     "CustomOpenIdConnectProvider": {