diff --git a/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/ContainerApps.json b/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/ContainerApps.json
index 382c410d016e..7c9d0b46de0e 100644
--- a/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/ContainerApps.json
+++ b/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/ContainerApps.json
@@ -847,6 +847,11 @@
           "type": "boolean",
           "readOnly": true
         },
+        "conflictWithEnvironmentCustomDomain": {
+          "description": "<code>true</code> if there is a conflict on the Container App's managed environment level custom domain; otherwise, <code>false</code>.",
+          "type": "boolean",
+          "readOnly": true
+        },
         "conflictingContainerAppResourceId": {
           "description": "Name of the conflicting Container App on the Managed Environment if it's within the same subscription.",
           "type": "string",
diff --git a/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/ContainerApps.json b/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/ContainerApps.json
index 6bd6b0d7fd06..0729945638c4 100644
--- a/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/ContainerApps.json
+++ b/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/ContainerApps.json
@@ -994,6 +994,11 @@
           "type": "boolean",
           "readOnly": true
         },
+        "conflictWithEnvironmentCustomDomain": {
+          "description": "<code>true</code> if there is a conflict on the Container App's managed environment level custom domain; otherwise, <code>false</code>.",
+          "type": "boolean",
+          "readOnly": true
+        },
         "conflictingContainerAppResourceId": {
           "description": "Name of the conflicting Container App on the Managed Environment if it's within the same subscription.",
           "type": "string",
diff --git a/specification/app/resource-manager/Microsoft.App/stable/2022-03-01/ContainerApps.json b/specification/app/resource-manager/Microsoft.App/stable/2022-03-01/ContainerApps.json
index fd77bfd70094..420a8777c640 100644
--- a/specification/app/resource-manager/Microsoft.App/stable/2022-03-01/ContainerApps.json
+++ b/specification/app/resource-manager/Microsoft.App/stable/2022-03-01/ContainerApps.json
@@ -840,6 +840,11 @@
           "type": "boolean",
           "readOnly": true
         },
+        "conflictWithEnvironmentCustomDomain": {
+          "description": "<code>true</code> if there is a conflict on the Container App's managed environment level custom domain; otherwise, <code>false</code>.",
+          "type": "boolean",
+          "readOnly": true
+        },
         "conflictingContainerAppResourceId": {
           "description": "Name of the conflicting Container App on the Managed Environment if it's within the same subscription.",
           "type": "string",