diff --git a/sdk/appplatform/azure-mgmt-appplatform/azure/mgmt/appplatform/models/_models.py b/sdk/appplatform/azure-mgmt-appplatform/azure/mgmt/appplatform/models/_models.py
index b35beb03ae11..88bf56af8995 100644
--- a/sdk/appplatform/azure-mgmt-appplatform/azure/mgmt/appplatform/models/_models.py
+++ b/sdk/appplatform/azure-mgmt-appplatform/azure/mgmt/appplatform/models/_models.py
@@ -219,11 +219,11 @@ class BindingResourceProperties(Model):
     Variables are only populated by the server, and will be ignored when
     sending a request.
 
-    :param resource_name: The name of the bound resource
-    :type resource_name: str
-    :param resource_type: The standard Azure resource type of the bound
+    :ivar resource_name: The name of the bound resource
+    :vartype resource_name: str
+    :ivar resource_type: The standard Azure resource type of the bound
      resource
-    :type resource_type: str
+    :vartype resource_type: str
     :param resource_id: The Azure resource id of the bound resource
     :type resource_id: str
     :param key: The key of the bound resource
@@ -240,6 +240,8 @@ class BindingResourceProperties(Model):
     """
 
     _validation = {
+        'resource_name': {'readonly': True},
+        'resource_type': {'readonly': True},
         'generated_properties': {'readonly': True},
         'created_at': {'readonly': True},
         'updated_at': {'readonly': True},
@@ -258,8 +260,8 @@ class BindingResourceProperties(Model):
 
     def __init__(self, **kwargs):
         super(BindingResourceProperties, self).__init__(**kwargs)
-        self.resource_name = kwargs.get('resource_name', None)
-        self.resource_type = kwargs.get('resource_type', None)
+        self.resource_name = None
+        self.resource_type = None
         self.resource_id = kwargs.get('resource_id', None)
         self.key = kwargs.get('key', None)
         self.binding_parameters = kwargs.get('binding_parameters', None)
@@ -587,14 +589,21 @@ def __init__(self, **kwargs):
 class CustomDomainProperties(Model):
     """Custom domain of app resource payload.
 
+    Variables are only populated by the server, and will be ignored when
+    sending a request.
+
     :param thumbprint: The thumbprint of bound certificate.
     :type thumbprint: str
-    :param app_name: The app name of domain.
-    :type app_name: str
+    :ivar app_name: The app name of domain.
+    :vartype app_name: str
     :param cert_name: The bound certificate name of domain.
     :type cert_name: str
     """
 
+    _validation = {
+        'app_name': {'readonly': True},
+    }
+
     _attribute_map = {
         'thumbprint': {'key': 'thumbprint', 'type': 'str'},
         'app_name': {'key': 'appName', 'type': 'str'},
@@ -604,7 +613,7 @@ class CustomDomainProperties(Model):
     def __init__(self, **kwargs):
         super(CustomDomainProperties, self).__init__(**kwargs)
         self.thumbprint = kwargs.get('thumbprint', None)
-        self.app_name = kwargs.get('app_name', None)
+        self.app_name = None
         self.cert_name = kwargs.get('cert_name', None)
 
 
diff --git a/sdk/appplatform/azure-mgmt-appplatform/azure/mgmt/appplatform/models/_models_py3.py b/sdk/appplatform/azure-mgmt-appplatform/azure/mgmt/appplatform/models/_models_py3.py
index 02ca3876fb32..625a8905343c 100644
--- a/sdk/appplatform/azure-mgmt-appplatform/azure/mgmt/appplatform/models/_models_py3.py
+++ b/sdk/appplatform/azure-mgmt-appplatform/azure/mgmt/appplatform/models/_models_py3.py
@@ -219,11 +219,11 @@ class BindingResourceProperties(Model):
     Variables are only populated by the server, and will be ignored when
     sending a request.
 
-    :param resource_name: The name of the bound resource
-    :type resource_name: str
-    :param resource_type: The standard Azure resource type of the bound
+    :ivar resource_name: The name of the bound resource
+    :vartype resource_name: str
+    :ivar resource_type: The standard Azure resource type of the bound
      resource
-    :type resource_type: str
+    :vartype resource_type: str
     :param resource_id: The Azure resource id of the bound resource
     :type resource_id: str
     :param key: The key of the bound resource
@@ -240,6 +240,8 @@ class BindingResourceProperties(Model):
     """
 
     _validation = {
+        'resource_name': {'readonly': True},
+        'resource_type': {'readonly': True},
         'generated_properties': {'readonly': True},
         'created_at': {'readonly': True},
         'updated_at': {'readonly': True},
@@ -256,10 +258,10 @@ class BindingResourceProperties(Model):
         'updated_at': {'key': 'updatedAt', 'type': 'str'},
     }
 
-    def __init__(self, *, resource_name: str=None, resource_type: str=None, resource_id: str=None, key: str=None, binding_parameters=None, **kwargs) -> None:
+    def __init__(self, *, resource_id: str=None, key: str=None, binding_parameters=None, **kwargs) -> None:
         super(BindingResourceProperties, self).__init__(**kwargs)
-        self.resource_name = resource_name
-        self.resource_type = resource_type
+        self.resource_name = None
+        self.resource_type = None
         self.resource_id = resource_id
         self.key = key
         self.binding_parameters = binding_parameters
@@ -587,24 +589,31 @@ def __init__(self, *, git_property=None, **kwargs) -> None:
 class CustomDomainProperties(Model):
     """Custom domain of app resource payload.
 
+    Variables are only populated by the server, and will be ignored when
+    sending a request.
+
     :param thumbprint: The thumbprint of bound certificate.
     :type thumbprint: str
-    :param app_name: The app name of domain.
-    :type app_name: str
+    :ivar app_name: The app name of domain.
+    :vartype app_name: str
     :param cert_name: The bound certificate name of domain.
     :type cert_name: str
     """
 
+    _validation = {
+        'app_name': {'readonly': True},
+    }
+
     _attribute_map = {
         'thumbprint': {'key': 'thumbprint', 'type': 'str'},
         'app_name': {'key': 'appName', 'type': 'str'},
         'cert_name': {'key': 'certName', 'type': 'str'},
     }
 
-    def __init__(self, *, thumbprint: str=None, app_name: str=None, cert_name: str=None, **kwargs) -> None:
+    def __init__(self, *, thumbprint: str=None, cert_name: str=None, **kwargs) -> None:
         super(CustomDomainProperties, self).__init__(**kwargs)
         self.thumbprint = thumbprint
-        self.app_name = app_name
+        self.app_name = None
         self.cert_name = cert_name