diff --git a/specification/securityinsights/resource-manager/Microsoft.SecurityInsights/preview/2019-01-01-preview/SecurityInsights.json b/specification/securityinsights/resource-manager/Microsoft.SecurityInsights/preview/2019-01-01-preview/SecurityInsights.json
index 4f18d368df9a..fd280dc50ef5 100644
--- a/specification/securityinsights/resource-manager/Microsoft.SecurityInsights/preview/2019-01-01-preview/SecurityInsights.json
+++ b/specification/securityinsights/resource-manager/Microsoft.SecurityInsights/preview/2019-01-01-preview/SecurityInsights.json
@@ -1905,7 +1905,7 @@
           "Check Data Connector Requirements"
         ],
         "description": "Get requirements state for a data connector type.",
-        "operationId": "listDataConnectorRequirements",
+        "operationId": "DataConnectorsCheckRequirements_Post",
         "parameters": [
           {
             "$ref": "#/parameters/ApiVersion"
@@ -3268,17 +3268,27 @@
       "allOf": [
         {
           "$ref": "#/definitions/DataConnectorsCheckRequirements"
-        },
+        }
+      ],
+      "description": "Represents AAD (Azure Active Directory) requirements check request.",
+      "properties": {
+        "properties": {
+          "$ref": "#/definitions/AADCheckRequirementsProperties",
+          "description": "AAD (Azure Active Directory) requirements check properties.",
+          "x-ms-client-flatten": true
+        }
+      },
+      "type": "object",
+      "x-ms-discriminator-value": "AzureActiveDirectory"
+    },
+    "AADCheckRequirementsProperties": {
+      "allOf": [
         {
           "$ref": "#/definitions/DataConnectorTenantId"
         }
       ],
       "description": "AAD (Azure Active Directory) requirements check properties.",
-      "type": "object",
-      "discriminator": "kind",
-      "required": [
-        "kind"
-      ]
+      "type": "object"
     },
     "AATPDataConnector": {
       "allOf": [
@@ -3313,17 +3323,27 @@
       "allOf": [
         {
           "$ref": "#/definitions/DataConnectorsCheckRequirements"
-        },
+        }
+      ],
+      "description": "Represents AATP (Azure Advanced Threat Protection) requirements check request.",
+      "properties": {
+        "properties": {
+          "$ref": "#/definitions/AATPCheckRequirementsProperties",
+          "description": "AATP (Azure Advanced Threat Protection) requirements check properties.",
+          "x-ms-client-flatten": true
+        }
+      },
+      "type": "object",
+      "x-ms-discriminator-value": "AzureAdvancedThreatProtection"
+    },
+    "AATPCheckRequirementsProperties": {
+      "allOf": [
         {
           "$ref": "#/definitions/DataConnectorTenantId"
         }
       ],
       "description": "AATP (Azure Advanced Threat Protection) requirements check properties.",
-      "type": "object",
-      "discriminator": "kind",
-      "required": [
-        "kind"
-      ]
+      "type": "object"
     },
     "ASCDataConnector": {
       "allOf": [
@@ -3358,23 +3378,31 @@
       "type": "object"
     },
     "ASCCheckRequirements": {
-      "description": "ASC (Azure Security Center) requirements check properties.",
       "allOf": [
         {
           "$ref": "#/definitions/DataConnectorsCheckRequirements"
         }
       ],
+      "description": "Represents ASC (Azure Security Center) requirements check request.",
+      "properties": {
+        "properties": {
+          "$ref": "#/definitions/ASCCheckRequirementsProperties",
+          "description": "ASC (Azure Security Center) requirements check properties.",
+          "x-ms-client-flatten": true
+        }
+      },
+      "type": "object",
+      "x-ms-discriminator-value": "AzureSecurityCenter"
+    },
+    "ASCCheckRequirementsProperties": {
+      "description": "ASC (Azure Security Center) requirements check properties.",
       "properties": {
         "subscriptionId": {
           "description": "The subscription id to connect to, and get the data from.",
           "type": "string"
         }
       },
-      "type": "object",
-      "discriminator": "kind",
-      "required": [
-        "kind"
-      ]
+      "type": "object"
     },
     "AccountEntity": {
       "allOf": [
@@ -3912,12 +3940,9 @@
           "$ref": "#/definitions/DataConnectorsCheckRequirements"
         }
       ],
-      "description": "Amazon Web Services CloudTrail requirements check properties.",
+      "description": "Amazon Web Services CloudTrail requirements check request.",
       "type": "object",
-      "discriminator": "kind",
-      "required": [
-        "kind"
-      ]
+      "x-ms-discriminator-value": "AmazonWebServicesCloudTrail"
     },
     "AzureResourceEntity": {
       "allOf": [
@@ -4827,12 +4852,18 @@
       ]
     },
     "DataConnectorsCheckRequirements": {
-      "allOf": [
-        {
-          "$ref": "#/definitions/DataConnectorKind"
+      "description": "Data connector requirements properties.",
+      "properties": {
+        "kind": {
+          "$ref": "#/definitions/DataConnectorKind",
+          "description": "Describes the kind of connector to be checked."
         }
-      ],
-      "description": "Data connector requirements properties."
+      },
+      "discriminator": "kind",
+      "type": "object",
+      "required": [
+        "kind"
+      ]
     },
     "DataConnectorAuthorizationState": {
       "description": "Describes the state of user's authorization for a connector kind.",
@@ -6356,17 +6387,27 @@
       "allOf": [
         {
           "$ref": "#/definitions/DataConnectorsCheckRequirements"
-        },
+        }
+      ],
+      "description": "Represents MCAS (Microsoft Cloud App Security) requirements check request.",
+      "properties": {
+        "properties": {
+          "$ref": "#/definitions/MCASCheckRequirementsProperties",
+          "description": "MCAS (Microsoft Cloud App Security) requirements check properties.",
+          "x-ms-client-flatten": true
+        }
+      },
+      "type": "object",
+      "x-ms-discriminator-value": "MicrosoftCloudAppSecurity"
+    },
+    "MCASCheckRequirementsProperties": {
+      "allOf": [
         {
           "$ref": "#/definitions/DataConnectorTenantId"
         }
       ],
       "description": "MCAS (Microsoft Cloud App Security) requirements check properties.",
-      "type": "object",
-      "discriminator": "kind",
-      "required": [
-        "kind"
-      ]
+      "type": "object"
     },
     "MDATPDataConnector": {
       "allOf": [
@@ -6401,17 +6442,27 @@
       "allOf": [
         {
           "$ref": "#/definitions/DataConnectorsCheckRequirements"
-        },
+        }
+      ],
+      "description": "Represents MDATP (Microsoft Defender Advanced Threat Protection) requirements check request.",
+      "properties": {
+        "properties": {
+          "$ref": "#/definitions/MDATPCheckRequirementsProperties",
+          "description": "MDATP (Microsoft Defender Advanced Threat Protection) requirements check properties.",
+          "x-ms-client-flatten": true
+        }
+      },
+      "type": "object",
+      "x-ms-discriminator-value": "MicrosoftDefenderAdvancedThreatProtection"
+    },
+    "MDATPCheckRequirementsProperties": {
+      "allOf": [
         {
           "$ref": "#/definitions/DataConnectorTenantId"
         }
       ],
       "description": "MDATP (Microsoft Defender Advanced Threat Protection) requirements check properties.",
-      "type": "object",
-      "discriminator": "kind",
-      "required": [
-        "kind"
-      ]
+      "type": "object"
     },
     "MalwareEntity": {
       "allOf": [
@@ -7882,17 +7933,28 @@
       "allOf": [
         {
           "$ref": "#/definitions/DataConnectorsCheckRequirements"
-        },
+        }
+      ],
+      "description": "Represents threat intelligence requirements check request.",
+      "properties": {
+        "properties": {
+          "$ref": "#/definitions/TICheckRequirementsProperties",
+          "description": "TI (Threat Intelligence) requirements check properties.",
+          "x-ms-client-flatten": true
+        }
+      },
+      "type": "object",
+      "x-ms-discriminator-value": "ThreatIntelligence"
+    },
+    "TICheckRequirementsProperties": {
+      "allOf": [
         {
           "$ref": "#/definitions/DataConnectorTenantId"
         }
       ],
       "description": "TI (Threat Intelligence) requirements check properties.",
-      "type": "object",
-      "discriminator": "kind",
-      "required": [
-        "kind"
-      ]
+      "properties": {},
+      "type": "object"
     },
     "TiTaxiiDataConnector": {
       "allOf": [
@@ -7969,17 +8031,27 @@
       "allOf": [
         {
           "$ref": "#/definitions/DataConnectorsCheckRequirements"
-        },
+        }
+      ],
+      "description": "Represents threat intelligence requirements check request.",
+      "properties": {
+        "properties": {
+          "$ref": "#/definitions/TiTaxiiCheckRequirementsProperties",
+          "description": "Ti Taxii (Threat Intelligence Taxii) requirements check properties.",
+          "x-ms-client-flatten": true
+        }
+      },
+      "type": "object",
+      "x-ms-discriminator-value": "ThreatIntelligenceTaxii"
+    },
+    "TiTaxiiCheckRequirementsProperties": {
+      "allOf": [
         {
           "$ref": "#/definitions/DataConnectorTenantId"
         }
       ],
-      "description": "Ti Taxii (Threat Intelligence Taxii) requirements check properties.",
-      "type": "object",
-      "discriminator": "kind",
-      "required": [
-        "kind"
-      ]
+      "description": "Threat Intelligence taxii client data connector properties.",
+      "type": "object"
     },
     "ThreatIntelligence": {
       "description": "ThreatIntelligence property bag.",