diff --git a/specification/iothub/resource-manager/Microsoft.Devices/preview/2021-02-01-preview/iothub.json b/specification/iothub/resource-manager/Microsoft.Devices/preview/2021-02-01-preview/iothub.json
index 71d10452c8a4..1ea903462028 100644
--- a/specification/iothub/resource-manager/Microsoft.Devices/preview/2021-02-01-preview/iothub.json
+++ b/specification/iothub/resource-manager/Microsoft.Devices/preview/2021-02-01-preview/iothub.json
@@ -4246,7 +4246,7 @@
           "enum": [
             "SystemAssigned",
             "UserAssigned",
-            "SystemAssigned,UserAssigned",
+            "SystemAssigned, UserAssigned",
             "None"
           ],
           "x-ms-enum": {
diff --git a/specification/iothub/resource-manager/Microsoft.Devices/preview/2021-03-03-preview/iothub.json b/specification/iothub/resource-manager/Microsoft.Devices/preview/2021-03-03-preview/iothub.json
index 98d5554a1b74..39215739404a 100644
--- a/specification/iothub/resource-manager/Microsoft.Devices/preview/2021-03-03-preview/iothub.json
+++ b/specification/iothub/resource-manager/Microsoft.Devices/preview/2021-03-03-preview/iothub.json
@@ -4274,7 +4274,7 @@
           "enum": [
             "SystemAssigned",
             "UserAssigned",
-            "SystemAssigned,UserAssigned",
+            "SystemAssigned, UserAssigned",
             "None"
           ],
           "x-ms-enum": {