diff --git a/specification/keyvault/resource-manager/Microsoft.KeyVault/preview/2018-02-14-preview/keyvault.json b/specification/keyvault/resource-manager/Microsoft.KeyVault/preview/2018-02-14-preview/keyvault.json
index e63e7e0fe96b..504e9cee079b 100644
--- a/specification/keyvault/resource-manager/Microsoft.KeyVault/preview/2018-02-14-preview/keyvault.json
+++ b/specification/keyvault/resource-manager/Microsoft.KeyVault/preview/2018-02-14-preview/keyvault.json
@@ -677,6 +677,7 @@
           "enum": [
             "A"
           ],
+          "x-ms-client-default": "A",
           "x-ms-enum": {
             "name": "SkuFamily",
             "modelAsString": true
diff --git a/specification/keyvault/resource-manager/Microsoft.KeyVault/preview/2020-04-01-preview/keyvault.json b/specification/keyvault/resource-manager/Microsoft.KeyVault/preview/2020-04-01-preview/keyvault.json
index 1f3e463ea937..f527a8a0c7c7 100644
--- a/specification/keyvault/resource-manager/Microsoft.KeyVault/preview/2020-04-01-preview/keyvault.json
+++ b/specification/keyvault/resource-manager/Microsoft.KeyVault/preview/2020-04-01-preview/keyvault.json
@@ -923,6 +923,7 @@
           "enum": [
             "A"
           ],
+          "x-ms-client-default": "A",
           "x-ms-enum": {
             "name": "SkuFamily",
             "modelAsString": true
diff --git a/specification/keyvault/resource-manager/Microsoft.KeyVault/preview/2020-04-01-preview/managedHsm.json b/specification/keyvault/resource-manager/Microsoft.KeyVault/preview/2020-04-01-preview/managedHsm.json
index 34462f6b4514..580f61bab4a9 100644
--- a/specification/keyvault/resource-manager/Microsoft.KeyVault/preview/2020-04-01-preview/managedHsm.json
+++ b/specification/keyvault/resource-manager/Microsoft.KeyVault/preview/2020-04-01-preview/managedHsm.json
@@ -353,6 +353,7 @@
           "enum": [
             "B"
           ],
+          "x-ms-client-default": "B",
           "x-ms-enum": {
             "name": "ManagedHsmSkuFamily",
             "modelAsString": true
diff --git a/specification/keyvault/resource-manager/Microsoft.KeyVault/stable/2015-06-01/keyvault.json b/specification/keyvault/resource-manager/Microsoft.KeyVault/stable/2015-06-01/keyvault.json
index d284f48944e7..a2e44a33cb41 100644
--- a/specification/keyvault/resource-manager/Microsoft.KeyVault/stable/2015-06-01/keyvault.json
+++ b/specification/keyvault/resource-manager/Microsoft.KeyVault/stable/2015-06-01/keyvault.json
@@ -250,6 +250,7 @@
           "enum": [
             "A"
           ],
+          "x-ms-client-default": "A",
           "x-ms-enum": {
             "name": "SkuFamily",
             "modelAsString": true
diff --git a/specification/keyvault/resource-manager/Microsoft.KeyVault/stable/2016-10-01/keyvault.json b/specification/keyvault/resource-manager/Microsoft.KeyVault/stable/2016-10-01/keyvault.json
index 2aba2f8c7b59..0e298de0cde2 100644
--- a/specification/keyvault/resource-manager/Microsoft.KeyVault/stable/2016-10-01/keyvault.json
+++ b/specification/keyvault/resource-manager/Microsoft.KeyVault/stable/2016-10-01/keyvault.json
@@ -676,6 +676,7 @@
           "enum": [
             "A"
           ],
+          "x-ms-client-default": "A",
           "x-ms-enum": {
             "name": "SkuFamily",
             "modelAsString": true
diff --git a/specification/keyvault/resource-manager/Microsoft.KeyVault/stable/2018-02-14/keyvault.json b/specification/keyvault/resource-manager/Microsoft.KeyVault/stable/2018-02-14/keyvault.json
index 0cb1851ec949..dfd830216102 100644
--- a/specification/keyvault/resource-manager/Microsoft.KeyVault/stable/2018-02-14/keyvault.json
+++ b/specification/keyvault/resource-manager/Microsoft.KeyVault/stable/2018-02-14/keyvault.json
@@ -924,6 +924,7 @@
           "enum": [
             "A"
           ],
+          "x-ms-client-default": "A",
           "x-ms-enum": {
             "name": "SkuFamily",
             "modelAsString": true
diff --git a/specification/keyvault/resource-manager/Microsoft.KeyVault/stable/2019-09-01/keyvault.json b/specification/keyvault/resource-manager/Microsoft.KeyVault/stable/2019-09-01/keyvault.json
index 415914cd9053..03580e76e435 100644
--- a/specification/keyvault/resource-manager/Microsoft.KeyVault/stable/2019-09-01/keyvault.json
+++ b/specification/keyvault/resource-manager/Microsoft.KeyVault/stable/2019-09-01/keyvault.json
@@ -924,6 +924,7 @@
           "enum": [
             "A"
           ],
+          "x-ms-client-default": "A",
           "x-ms-enum": {
             "name": "SkuFamily",
             "modelAsString": true