diff --git a/schemas/2021-09-01-preview/Microsoft.Dashboard.json b/schemas/2021-09-01-preview/Microsoft.Dashboard.json
index ee8048de7f..d4153251a8 100644
--- a/schemas/2021-09-01-preview/Microsoft.Dashboard.json
+++ b/schemas/2021-09-01-preview/Microsoft.Dashboard.json
@@ -98,6 +98,19 @@
     "ManagedGrafanaProperties": {
       "type": "object",
       "properties": {
+        "autoGeneratedDomainNameLabelScope": {
+          "oneOf": [
+            {
+              "type": "string",
+              "enum": [
+                "TenantReuse"
+              ]
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ]
+        },
         "provisioningState": {
           "oneOf": [
             {