diff --git a/lib/services/iotcentral/lib/iotCentralClient.d.ts b/lib/services/iotcentral/lib/iotCentralClient.d.ts
index ba5feaff35..800e93ec54 100644
--- a/lib/services/iotcentral/lib/iotCentralClient.d.ts
+++ b/lib/services/iotcentral/lib/iotCentralClient.d.ts
@@ -21,7 +21,7 @@ export default class IotCentralClient extends AzureServiceClient {
    * @class
    * @param {credentials} credentials - Credentials needed for the client to connect to Azure.
    *
-   * @param {uuid} subscriptionId - The subscription identifier.
+   * @param {string} subscriptionId - The subscription identifier.
    *
    * @param {string} [baseUri] - The base URI of the service.
    *
diff --git a/lib/services/iotcentral/lib/iotCentralClient.js b/lib/services/iotcentral/lib/iotCentralClient.js
index cdf53658d7..bbe1db6fd6 100644
--- a/lib/services/iotcentral/lib/iotCentralClient.js
+++ b/lib/services/iotcentral/lib/iotCentralClient.js
@@ -27,7 +27,7 @@ class IotCentralClient extends ServiceClient {
   /**
    * Create a IotCentralClient.
    * @param {credentials} credentials - Credentials needed for the client to connect to Azure.
-   * @param {uuid} subscriptionId - The subscription identifier.
+   * @param {string} subscriptionId - The subscription identifier.
    * @param {string} [baseUri] - The base URI of the service.
    * @param {object} [options] - The parameter options
    * @param {Array} [options.filters] - Filters to be added to the request pipeline
diff --git a/lib/services/iotcentral/lib/operations/apps.js b/lib/services/iotcentral/lib/operations/apps.js
index 134dee6621..62e3b3ef1b 100644
--- a/lib/services/iotcentral/lib/operations/apps.js
+++ b/lib/services/iotcentral/lib/operations/apps.js
@@ -53,35 +53,18 @@ function _get(resourceGroupName, resourceName, options, callback) {
   }
   // Validate
   try {
-    if (this.client.subscriptionId === null || this.client.subscriptionId === undefined || typeof this.client.subscriptionId.valueOf() !== 'string' || !msRest.isValidUuid(this.client.subscriptionId)) {
-      throw new Error('this.client.subscriptionId cannot be null or undefined and it must be of type string and must be a valid uuid.');
+    if (this.client.apiVersion === null || this.client.apiVersion === undefined || typeof this.client.apiVersion.valueOf() !== 'string') {
+      throw new Error('this.client.apiVersion cannot be null or undefined and it must be of type string.');
+    }
+    if (this.client.subscriptionId === null || this.client.subscriptionId === undefined || typeof this.client.subscriptionId.valueOf() !== 'string') {
+      throw new Error('this.client.subscriptionId cannot be null or undefined and it must be of type string.');
     }
     if (resourceGroupName === null || resourceGroupName === undefined || typeof resourceGroupName.valueOf() !== 'string') {
       throw new Error('resourceGroupName cannot be null or undefined and it must be of type string.');
     }
-    if (resourceGroupName !== null && resourceGroupName !== undefined) {
-      if (resourceGroupName.length > 64)
-      {
-        throw new Error('"resourceGroupName" should satisfy the constraint - "MaxLength": 64');
-      }
-      if (resourceGroupName.length < 1)
-      {
-        throw new Error('"resourceGroupName" should satisfy the constraint - "MinLength": 1');
-      }
-    }
     if (resourceName === null || resourceName === undefined || typeof resourceName.valueOf() !== 'string') {
       throw new Error('resourceName cannot be null or undefined and it must be of type string.');
     }
-    if (resourceName !== null && resourceName !== undefined) {
-      if (resourceName.length > 100)
-      {
-        throw new Error('"resourceName" should satisfy the constraint - "MaxLength": 100');
-      }
-      if (resourceName.length < 1)
-      {
-        throw new Error('"resourceName" should satisfy the constraint - "MinLength": 1');
-      }
-    }
     if (this.client.acceptLanguage !== null && this.client.acceptLanguage !== undefined && typeof this.client.acceptLanguage.valueOf() !== 'string') {
       throw new Error('this.client.acceptLanguage must be of type string.');
     }
@@ -92,7 +75,7 @@ function _get(resourceGroupName, resourceName, options, callback) {
   // Construct URL
   let baseUrl = this.client.baseUri;
   let requestUrl = baseUrl + (baseUrl.endsWith('/') ? '' : '/') + 'subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.IoTCentral/IoTApps/{resourceName}';
-  requestUrl = requestUrl.replace('{subscriptionId}', encodeURIComponent(this.client.subscriptionId.toString()));
+  requestUrl = requestUrl.replace('{subscriptionId}', encodeURIComponent(this.client.subscriptionId));
   requestUrl = requestUrl.replace('{resourceGroupName}', encodeURIComponent(resourceGroupName));
   requestUrl = requestUrl.replace('{resourceName}', encodeURIComponent(resourceName));
   let queryParameters = [];
@@ -475,8 +458,11 @@ function _listBySubscription(options, callback) {
   }
   // Validate
   try {
-    if (this.client.subscriptionId === null || this.client.subscriptionId === undefined || typeof this.client.subscriptionId.valueOf() !== 'string' || !msRest.isValidUuid(this.client.subscriptionId)) {
-      throw new Error('this.client.subscriptionId cannot be null or undefined and it must be of type string and must be a valid uuid.');
+    if (this.client.apiVersion === null || this.client.apiVersion === undefined || typeof this.client.apiVersion.valueOf() !== 'string') {
+      throw new Error('this.client.apiVersion cannot be null or undefined and it must be of type string.');
+    }
+    if (this.client.subscriptionId === null || this.client.subscriptionId === undefined || typeof this.client.subscriptionId.valueOf() !== 'string') {
+      throw new Error('this.client.subscriptionId cannot be null or undefined and it must be of type string.');
     }
     if (this.client.acceptLanguage !== null && this.client.acceptLanguage !== undefined && typeof this.client.acceptLanguage.valueOf() !== 'string') {
       throw new Error('this.client.acceptLanguage must be of type string.');
@@ -488,7 +474,7 @@ function _listBySubscription(options, callback) {
   // Construct URL
   let baseUrl = this.client.baseUri;
   let requestUrl = baseUrl + (baseUrl.endsWith('/') ? '' : '/') + 'subscriptions/{subscriptionId}/providers/Microsoft.IoTCentral/IoTApps';
-  requestUrl = requestUrl.replace('{subscriptionId}', encodeURIComponent(this.client.subscriptionId.toString()));
+  requestUrl = requestUrl.replace('{subscriptionId}', encodeURIComponent(this.client.subscriptionId));
   let queryParameters = [];
   queryParameters.push('api-version=' + encodeURIComponent(this.client.apiVersion));
   if (queryParameters.length > 0) {
@@ -609,22 +595,15 @@ function _listByResourceGroup(resourceGroupName, options, callback) {
   }
   // Validate
   try {
-    if (this.client.subscriptionId === null || this.client.subscriptionId === undefined || typeof this.client.subscriptionId.valueOf() !== 'string' || !msRest.isValidUuid(this.client.subscriptionId)) {
-      throw new Error('this.client.subscriptionId cannot be null or undefined and it must be of type string and must be a valid uuid.');
+    if (this.client.apiVersion === null || this.client.apiVersion === undefined || typeof this.client.apiVersion.valueOf() !== 'string') {
+      throw new Error('this.client.apiVersion cannot be null or undefined and it must be of type string.');
+    }
+    if (this.client.subscriptionId === null || this.client.subscriptionId === undefined || typeof this.client.subscriptionId.valueOf() !== 'string') {
+      throw new Error('this.client.subscriptionId cannot be null or undefined and it must be of type string.');
     }
     if (resourceGroupName === null || resourceGroupName === undefined || typeof resourceGroupName.valueOf() !== 'string') {
       throw new Error('resourceGroupName cannot be null or undefined and it must be of type string.');
     }
-    if (resourceGroupName !== null && resourceGroupName !== undefined) {
-      if (resourceGroupName.length > 64)
-      {
-        throw new Error('"resourceGroupName" should satisfy the constraint - "MaxLength": 64');
-      }
-      if (resourceGroupName.length < 1)
-      {
-        throw new Error('"resourceGroupName" should satisfy the constraint - "MinLength": 1');
-      }
-    }
     if (this.client.acceptLanguage !== null && this.client.acceptLanguage !== undefined && typeof this.client.acceptLanguage.valueOf() !== 'string') {
       throw new Error('this.client.acceptLanguage must be of type string.');
     }
@@ -635,7 +614,7 @@ function _listByResourceGroup(resourceGroupName, options, callback) {
   // Construct URL
   let baseUrl = this.client.baseUri;
   let requestUrl = baseUrl + (baseUrl.endsWith('/') ? '' : '/') + 'subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.IoTCentral/IoTApps';
-  requestUrl = requestUrl.replace('{subscriptionId}', encodeURIComponent(this.client.subscriptionId.toString()));
+  requestUrl = requestUrl.replace('{subscriptionId}', encodeURIComponent(this.client.subscriptionId));
   requestUrl = requestUrl.replace('{resourceGroupName}', encodeURIComponent(resourceGroupName));
   let queryParameters = [];
   queryParameters.push('api-version=' + encodeURIComponent(this.client.apiVersion));
@@ -758,8 +737,11 @@ function _checkNameAvailability(name, options, callback) {
   }
   // Validate
   try {
-    if (this.client.subscriptionId === null || this.client.subscriptionId === undefined || typeof this.client.subscriptionId.valueOf() !== 'string' || !msRest.isValidUuid(this.client.subscriptionId)) {
-      throw new Error('this.client.subscriptionId cannot be null or undefined and it must be of type string and must be a valid uuid.');
+    if (this.client.apiVersion === null || this.client.apiVersion === undefined || typeof this.client.apiVersion.valueOf() !== 'string') {
+      throw new Error('this.client.apiVersion cannot be null or undefined and it must be of type string.');
+    }
+    if (this.client.subscriptionId === null || this.client.subscriptionId === undefined || typeof this.client.subscriptionId.valueOf() !== 'string') {
+      throw new Error('this.client.subscriptionId cannot be null or undefined and it must be of type string.');
     }
     if (name === null || name === undefined || typeof name.valueOf() !== 'string') {
       throw new Error('name cannot be null or undefined and it must be of type string.');
@@ -779,7 +761,7 @@ function _checkNameAvailability(name, options, callback) {
   // Construct URL
   let baseUrl = this.client.baseUri;
   let requestUrl = baseUrl + (baseUrl.endsWith('/') ? '' : '/') + 'subscriptions/{subscriptionId}/providers/Microsoft.IoTCentral/checkNameAvailability';
-  requestUrl = requestUrl.replace('{subscriptionId}', encodeURIComponent(this.client.subscriptionId.toString()));
+  requestUrl = requestUrl.replace('{subscriptionId}', encodeURIComponent(this.client.subscriptionId));
   let queryParameters = [];
   queryParameters.push('api-version=' + encodeURIComponent(this.client.apiVersion));
   if (queryParameters.length > 0) {
@@ -941,35 +923,18 @@ function _beginCreateOrUpdate(resourceGroupName, resourceName, app, options, cal
   }
   // Validate
   try {
-    if (this.client.subscriptionId === null || this.client.subscriptionId === undefined || typeof this.client.subscriptionId.valueOf() !== 'string' || !msRest.isValidUuid(this.client.subscriptionId)) {
-      throw new Error('this.client.subscriptionId cannot be null or undefined and it must be of type string and must be a valid uuid.');
+    if (this.client.apiVersion === null || this.client.apiVersion === undefined || typeof this.client.apiVersion.valueOf() !== 'string') {
+      throw new Error('this.client.apiVersion cannot be null or undefined and it must be of type string.');
+    }
+    if (this.client.subscriptionId === null || this.client.subscriptionId === undefined || typeof this.client.subscriptionId.valueOf() !== 'string') {
+      throw new Error('this.client.subscriptionId cannot be null or undefined and it must be of type string.');
     }
     if (resourceGroupName === null || resourceGroupName === undefined || typeof resourceGroupName.valueOf() !== 'string') {
       throw new Error('resourceGroupName cannot be null or undefined and it must be of type string.');
     }
-    if (resourceGroupName !== null && resourceGroupName !== undefined) {
-      if (resourceGroupName.length > 64)
-      {
-        throw new Error('"resourceGroupName" should satisfy the constraint - "MaxLength": 64');
-      }
-      if (resourceGroupName.length < 1)
-      {
-        throw new Error('"resourceGroupName" should satisfy the constraint - "MinLength": 1');
-      }
-    }
     if (resourceName === null || resourceName === undefined || typeof resourceName.valueOf() !== 'string') {
       throw new Error('resourceName cannot be null or undefined and it must be of type string.');
     }
-    if (resourceName !== null && resourceName !== undefined) {
-      if (resourceName.length > 100)
-      {
-        throw new Error('"resourceName" should satisfy the constraint - "MaxLength": 100');
-      }
-      if (resourceName.length < 1)
-      {
-        throw new Error('"resourceName" should satisfy the constraint - "MinLength": 1');
-      }
-    }
     if (app === null || app === undefined) {
       throw new Error('app cannot be null or undefined.');
     }
@@ -983,7 +948,7 @@ function _beginCreateOrUpdate(resourceGroupName, resourceName, app, options, cal
   // Construct URL
   let baseUrl = this.client.baseUri;
   let requestUrl = baseUrl + (baseUrl.endsWith('/') ? '' : '/') + 'subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.IoTCentral/IoTApps/{resourceName}';
-  requestUrl = requestUrl.replace('{subscriptionId}', encodeURIComponent(this.client.subscriptionId.toString()));
+  requestUrl = requestUrl.replace('{subscriptionId}', encodeURIComponent(this.client.subscriptionId));
   requestUrl = requestUrl.replace('{resourceGroupName}', encodeURIComponent(resourceGroupName));
   requestUrl = requestUrl.replace('{resourceName}', encodeURIComponent(resourceName));
   let queryParameters = [];
@@ -1154,35 +1119,18 @@ function _beginUpdate(resourceGroupName, resourceName, appPatch, options, callba
   }
   // Validate
   try {
-    if (this.client.subscriptionId === null || this.client.subscriptionId === undefined || typeof this.client.subscriptionId.valueOf() !== 'string' || !msRest.isValidUuid(this.client.subscriptionId)) {
-      throw new Error('this.client.subscriptionId cannot be null or undefined and it must be of type string and must be a valid uuid.');
+    if (this.client.apiVersion === null || this.client.apiVersion === undefined || typeof this.client.apiVersion.valueOf() !== 'string') {
+      throw new Error('this.client.apiVersion cannot be null or undefined and it must be of type string.');
+    }
+    if (this.client.subscriptionId === null || this.client.subscriptionId === undefined || typeof this.client.subscriptionId.valueOf() !== 'string') {
+      throw new Error('this.client.subscriptionId cannot be null or undefined and it must be of type string.');
     }
     if (resourceGroupName === null || resourceGroupName === undefined || typeof resourceGroupName.valueOf() !== 'string') {
       throw new Error('resourceGroupName cannot be null or undefined and it must be of type string.');
     }
-    if (resourceGroupName !== null && resourceGroupName !== undefined) {
-      if (resourceGroupName.length > 64)
-      {
-        throw new Error('"resourceGroupName" should satisfy the constraint - "MaxLength": 64');
-      }
-      if (resourceGroupName.length < 1)
-      {
-        throw new Error('"resourceGroupName" should satisfy the constraint - "MinLength": 1');
-      }
-    }
     if (resourceName === null || resourceName === undefined || typeof resourceName.valueOf() !== 'string') {
       throw new Error('resourceName cannot be null or undefined and it must be of type string.');
     }
-    if (resourceName !== null && resourceName !== undefined) {
-      if (resourceName.length > 100)
-      {
-        throw new Error('"resourceName" should satisfy the constraint - "MaxLength": 100');
-      }
-      if (resourceName.length < 1)
-      {
-        throw new Error('"resourceName" should satisfy the constraint - "MinLength": 1');
-      }
-    }
     if (appPatch === null || appPatch === undefined) {
       throw new Error('appPatch cannot be null or undefined.');
     }
@@ -1196,7 +1144,7 @@ function _beginUpdate(resourceGroupName, resourceName, appPatch, options, callba
   // Construct URL
   let baseUrl = this.client.baseUri;
   let requestUrl = baseUrl + (baseUrl.endsWith('/') ? '' : '/') + 'subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.IoTCentral/IoTApps/{resourceName}';
-  requestUrl = requestUrl.replace('{subscriptionId}', encodeURIComponent(this.client.subscriptionId.toString()));
+  requestUrl = requestUrl.replace('{subscriptionId}', encodeURIComponent(this.client.subscriptionId));
   requestUrl = requestUrl.replace('{resourceGroupName}', encodeURIComponent(resourceGroupName));
   requestUrl = requestUrl.replace('{resourceName}', encodeURIComponent(resourceName));
   let queryParameters = [];
@@ -1335,35 +1283,18 @@ function _beginDeleteMethod(resourceGroupName, resourceName, options, callback)
   }
   // Validate
   try {
-    if (this.client.subscriptionId === null || this.client.subscriptionId === undefined || typeof this.client.subscriptionId.valueOf() !== 'string' || !msRest.isValidUuid(this.client.subscriptionId)) {
-      throw new Error('this.client.subscriptionId cannot be null or undefined and it must be of type string and must be a valid uuid.');
+    if (this.client.apiVersion === null || this.client.apiVersion === undefined || typeof this.client.apiVersion.valueOf() !== 'string') {
+      throw new Error('this.client.apiVersion cannot be null or undefined and it must be of type string.');
+    }
+    if (this.client.subscriptionId === null || this.client.subscriptionId === undefined || typeof this.client.subscriptionId.valueOf() !== 'string') {
+      throw new Error('this.client.subscriptionId cannot be null or undefined and it must be of type string.');
     }
     if (resourceGroupName === null || resourceGroupName === undefined || typeof resourceGroupName.valueOf() !== 'string') {
       throw new Error('resourceGroupName cannot be null or undefined and it must be of type string.');
     }
-    if (resourceGroupName !== null && resourceGroupName !== undefined) {
-      if (resourceGroupName.length > 64)
-      {
-        throw new Error('"resourceGroupName" should satisfy the constraint - "MaxLength": 64');
-      }
-      if (resourceGroupName.length < 1)
-      {
-        throw new Error('"resourceGroupName" should satisfy the constraint - "MinLength": 1');
-      }
-    }
     if (resourceName === null || resourceName === undefined || typeof resourceName.valueOf() !== 'string') {
       throw new Error('resourceName cannot be null or undefined and it must be of type string.');
     }
-    if (resourceName !== null && resourceName !== undefined) {
-      if (resourceName.length > 100)
-      {
-        throw new Error('"resourceName" should satisfy the constraint - "MaxLength": 100');
-      }
-      if (resourceName.length < 1)
-      {
-        throw new Error('"resourceName" should satisfy the constraint - "MinLength": 1');
-      }
-    }
     if (this.client.acceptLanguage !== null && this.client.acceptLanguage !== undefined && typeof this.client.acceptLanguage.valueOf() !== 'string') {
       throw new Error('this.client.acceptLanguage must be of type string.');
     }
@@ -1374,7 +1305,7 @@ function _beginDeleteMethod(resourceGroupName, resourceName, options, callback)
   // Construct URL
   let baseUrl = this.client.baseUri;
   let requestUrl = baseUrl + (baseUrl.endsWith('/') ? '' : '/') + 'subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.IoTCentral/IoTApps/{resourceName}';
-  requestUrl = requestUrl.replace('{subscriptionId}', encodeURIComponent(this.client.subscriptionId.toString()));
+  requestUrl = requestUrl.replace('{subscriptionId}', encodeURIComponent(this.client.subscriptionId));
   requestUrl = requestUrl.replace('{resourceGroupName}', encodeURIComponent(resourceGroupName));
   requestUrl = requestUrl.replace('{resourceName}', encodeURIComponent(resourceName));
   let queryParameters = [];
diff --git a/lib/services/iotcentral/lib/operations/operations.js b/lib/services/iotcentral/lib/operations/operations.js
index 532ae30eaf..cd2600ac65 100644
--- a/lib/services/iotcentral/lib/operations/operations.js
+++ b/lib/services/iotcentral/lib/operations/operations.js
@@ -47,6 +47,9 @@ function _list(options, callback) {
   }
   // Validate
   try {
+    if (this.client.apiVersion === null || this.client.apiVersion === undefined || typeof this.client.apiVersion.valueOf() !== 'string') {
+      throw new Error('this.client.apiVersion cannot be null or undefined and it must be of type string.');
+    }
     if (this.client.acceptLanguage !== null && this.client.acceptLanguage !== undefined && typeof this.client.acceptLanguage.valueOf() !== 'string') {
       throw new Error('this.client.acceptLanguage must be of type string.');
     }