diff --git a/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/desktopvirtualization.json b/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/desktopvirtualization.json
index 8bee1f0e764a..08655276ef04 100644
--- a/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/desktopvirtualization.json
+++ b/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/desktopvirtualization.json
@@ -2275,6 +2275,10 @@
           "$ref": "#/definitions/RegistrationInfoPatch",
           "description": "The registration info of HostPool."
         },
+        "vmTemplate": {
+          "type": "string",
+          "description": "VM template for sessionhosts configuration within hostpool."
+        },
         "ssoContext": {
           "type": "string",
           "description": "Path to keyvault containing ssoContext secret."
diff --git a/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_Create.json b/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_Create.json
index 8f7ebb829d8a..ba6d5d97f5ff 100644
--- a/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_Create.json
+++ b/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_Create.json
@@ -22,6 +22,7 @@
           "expirationTime": "2020-10-01T14:01:54.9571247Z",
           "registrationTokenOperation": "Update"
         },
+        "vmTemplate": "{json:json}",
         "ssoContext": "KeyVaultPath",
         "preferredAppGroupType": "Desktop"
       }
@@ -42,7 +43,7 @@
           "friendlyName": "friendly",
           "description": "des1",
           "hostPoolType": "Pooled",
-          "personalDesktopAssignmentType": null,
+          "personalDesktopAssignmentType": "Automatic",
           "customRdpProperty": null,
           "maxSessionLimit": 999999,
           "loadBalancerType": "BreadthFirst",
@@ -53,6 +54,7 @@
             "token": "token",
             "registrationTokenOperation": "Update"
           },
+          "vmTemplate": "{json:json}",
           "ssoContext": null,
           "preferredAppGroupType": "Desktop"
         }
@@ -72,7 +74,7 @@
           "friendlyName": "friendly",
           "description": "des1",
           "hostPoolType": "Pooled",
-          "personalDesktopAssignmentType": null,
+          "personalDesktopAssignmentType": "Automatic",
           "customRdpProperty": null,
           "maxSessionLimit": 999999,
           "loadBalancerType": "BreadthFirst",
diff --git a/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_Delete.json b/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_Delete.json
index fba66ca5ceb9..434d80ce221b 100644
--- a/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_Delete.json
+++ b/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_Delete.json
@@ -20,7 +20,7 @@
         "friendlyName": "friendly",
         "description": "des1",
         "hostPoolType": "Pooled",
-        "personalDesktopAssignmentType": null,
+        "personalDesktopAssignmentType": "Automatic",
         "customRdpProperty": null,
         "maxSessionLimit": 999999,
         "loadBalancerType": "BreadthFirst",
@@ -31,6 +31,7 @@
           "token": "token",
           "registrationTokenOperation": "Update"
         },
+        "vmTemplate": "{json:json}",
         "ssoContext": null
       }
     },
diff --git a/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_Get.json b/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_Get.json
index e4b3609d0a4a..175c4fef704e 100644
--- a/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_Get.json
+++ b/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_Get.json
@@ -20,7 +20,7 @@
           "friendlyName": "friendly",
           "description": "des1",
           "hostPoolType": "Pooled",
-          "personalDesktopAssignmentType": null,
+          "personalDesktopAssignmentType": "Automatic",
           "customRdpProperty": null,
           "maxSessionLimit": 999999,
           "loadBalancerType": "BreadthFirst",
@@ -31,6 +31,7 @@
             "token": "token",
             "registrationTokenOperation": "Update"
           },
+          "vmTemplate": "{json:json}",
           "ssoContext": null,
           "preferredAppGroupType": "Desktop"
         }
diff --git a/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_List.json b/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_List.json
index 4d63045e0f2c..302dcc34c598 100644
--- a/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_List.json
+++ b/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_List.json
@@ -20,7 +20,7 @@
               "friendlyName": "friendly",
               "description": "des1",
               "hostPoolType": "Pooled",
-              "personalDesktopAssignmentType": null,
+              "personalDesktopAssignmentType": "Automatic",
               "customRdpProperty": null,
               "maxSessionLimit": 999999,
               "loadBalancerType": "BreadthFirst",
@@ -31,6 +31,7 @@
                 "token": "token",
                 "registrationTokenOperation": "Update"
               },
+              "vmTemplate": "{json:json}",
               "ssoContext": null,
               "preferredAppGroupType": "Desktop"
             }
@@ -48,7 +49,7 @@
               "friendlyName": "friendly",
               "description": "des1",
               "hostPoolType": "Pooled",
-              "personalDesktopAssignmentType": null,
+              "personalDesktopAssignmentType": "Automatic",
               "customRdpProperty": null,
               "maxSessionLimit": 999999,
               "loadBalancerType": "BreadthFirst",
@@ -59,6 +60,7 @@
                 "token": "token",
                 "registrationTokenOperation": "Update"
               },
+              "vmTemplate": "{json:json}",
               "ssoContext": null,
               "preferredAppGroupType": "Desktop"
             }
diff --git a/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_ListByResourceGroup.json b/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_ListByResourceGroup.json
index a298ffa4a1ef..6ae671b69976 100644
--- a/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_ListByResourceGroup.json
+++ b/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_ListByResourceGroup.json
@@ -21,7 +21,7 @@
               "friendlyName": "friendly",
               "description": "des1",
               "hostPoolType": "Pooled",
-              "personalDesktopAssignmentType": null,
+              "personalDesktopAssignmentType": "Automatic",
               "customRdpProperty": null,
               "maxSessionLimit": 999999,
               "loadBalancerType": "BreadthFirst",
@@ -32,6 +32,7 @@
                 "token": "token",
                 "registrationTokenOperation": "Update"
               },
+              "vmTemplate": "{json:json}",
               "ssoContext": null,
               "preferredAppGroupType": "Desktop"
             }
@@ -49,7 +50,7 @@
               "friendlyName": "friendly",
               "description": "des1",
               "hostPoolType": "Pooled",
-              "personalDesktopAssignmentType": null,
+              "personalDesktopAssignmentType": "Automatic",
               "customRdpProperty": null,
               "maxSessionLimit": 999999,
               "loadBalancerType": "BreadthFirst",
@@ -60,6 +61,7 @@
                 "token": "token",
                 "registrationTokenOperation": "Update"
               },
+              "vmTemplate": "{json:json}",
               "ssoContext": null,
               "preferredAppGroupType": "Desktop"
             }
diff --git a/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_Update.json b/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_Update.json
index 7eb76d9cbb1f..c885b024272c 100644
--- a/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_Update.json
+++ b/specification/desktopvirtualization/resource-manager/Microsoft.DesktopVirtualization/preview/2019-12-10-preview/examples/HostPool_Update.json
@@ -20,6 +20,7 @@
           "expirationTime": "2020-10-01T15:01:54.9571247Z",
           "registrationTokenOperation": "Update"
         },
+        "vmTemplate": "{json:json}",
         "ssoContext": "KeyVaultPath"
       }
     }
@@ -39,7 +40,7 @@
           "friendlyName": "friendly",
           "description": "des1",
           "hostPoolType": "Pooled",
-          "personalDesktopAssignmentType": null,
+          "personalDesktopAssignmentType": "Automatic",
           "customRdpProperty": null,
           "maxSessionLimit": 999999,
           "loadBalancerType": "BreadthFirst",
@@ -50,6 +51,7 @@
             "token": "token",
             "registrationTokenOperation": "Update"
           },
+          "vmTemplate": "{json:json}",
           "ssoContext": null,
           "preferredAppGroupType": "Desktop"
         }