diff --git a/common-npm-packages/azure-arm-rest/Tests/azure-arm-app-service-tests.ts b/common-npm-packages/azure-arm-rest/Tests/azure-arm-app-service-tests.ts
index ae2dd248..71ac2305 100644
--- a/common-npm-packages/azure-arm-rest/Tests/azure-arm-app-service-tests.ts
+++ b/common-npm-packages/azure-arm-rest/Tests/azure-arm-app-service-tests.ts
@@ -4,6 +4,8 @@ import { AzureEndpoint } from '../azureModels';
 import * as querystring from 'querystring';
 import tl = require('azure-pipelines-task-lib/task');
 var endpoint = getMockEndpoint();
+var msi2018endpoint = getMockEndpoint("ManagedServiceIdentity");
+var msi2019endpoint = getMockEndpoint("ManagedServiceIdentity", null, true);
 
 mockAzureAppServiceTests();
 
@@ -114,8 +116,8 @@ class AzureAppServiceTests {
         });
     }
 
-    public static async get() {
-        var appSerivce: AzureAppService = new AzureAppService(endpoint, "MOCK_RESOURCE_GROUP_NAME", "MOCK_APP_SERVICE_NAME");
+    public static async get(testEndpoint: AzureEndpoint) {
+        var appSerivce: AzureAppService = new AzureAppService(testEndpoint, "MOCK_RESOURCE_GROUP_NAME", "MOCK_APP_SERVICE_NAME");
         try {
             var value = await appSerivce.get();
             console.log('MOCK_APP_SERVICE_NAME ID: ' + value.id);
@@ -125,7 +127,7 @@ class AzureAppServiceTests {
             tl.setResult(tl.TaskResult.Failed, 'AzureAppServiceTests.get() should have passed but failed');
         }
         
-        var appSerivceSlot: AzureAppService = new AzureAppService(endpoint, "MOCK_RESOURCE_GROUP_NAME", "MOCK_APP_SERVICE_NAME", "MOCK_SLOT_NAME");
+        var appSerivceSlot: AzureAppService = new AzureAppService(testEndpoint, "MOCK_RESOURCE_GROUP_NAME", "MOCK_APP_SERVICE_NAME", "MOCK_SLOT_NAME");
         try {
             await appSerivceSlot.get();
             tl.setResult(tl.TaskResult.Failed, 'AzureAppServiceTests.get() should have failed but passed');
@@ -368,7 +370,7 @@ async function RUNTESTS() {
     await AzureAppServiceTests.swap();
     await AzureAppServiceTests.swapSlotWithPreview();
     await AzureAppServiceTests.cancelSwapSlotWithPreview();
-    await AzureAppServiceTests.get();
+    await AzureAppServiceTests.get(endpoint);
     await AzureAppServiceTests.getPublishingProfileWithSecrets();
     await AzureAppServiceTests.getPublishingCredentials();
     await AzureAppServiceTests.getApplicationSettings();
@@ -378,6 +380,10 @@ async function RUNTESTS() {
     await AzureAppServiceTests.patchConfiguration();
     await AzureAppServiceTests.getMetadata();
     await AzureAppServiceTests.updateMetadata();
+
+    // Test MSI behaviors
+    await AzureAppServiceTests.get(msi2018endpoint);
+    await AzureAppServiceTests.get(msi2019endpoint);
 }
 
-RUNTESTS();
\ No newline at end of file
+RUNTESTS();
diff --git a/common-npm-packages/azure-arm-rest/Tests/mock_utils.ts b/common-npm-packages/azure-arm-rest/Tests/mock_utils.ts
index 81111e70..eb8825c9 100644
--- a/common-npm-packages/azure-arm-rest/Tests/mock_utils.ts
+++ b/common-npm-packages/azure-arm-rest/Tests/mock_utils.ts
@@ -4,7 +4,7 @@ import * as querystring from "querystring";
 import { ApplicationTokenCredentials } from '../azure-arm-common';
 export var nock = require('nock');
 
-export function getMockEndpoint(scheme?: string, msiClientId?: string) {
+export function getMockEndpoint(scheme?: string, msiClientId?: string, mockMsi2019: boolean = false) {
     process.env["AZURE_HTTP_USER_AGENT"] = "TEST_AGENT";
 
     var endpoint: AzureEndpoint = {
@@ -37,13 +37,22 @@ export function getMockEndpoint(scheme?: string, msiClientId?: string) {
         access_token: "DUMMY_ACCESS_TOKEN"
     }).persist(); 
 
-    let apiVersion = "2018-02-01";
+    const tokenEndpoint = "http://169.254.169.254/metadata/identity/oauth2/token";
+    const reqheaders = {
+        "Metadata": true
+    };
+
+    if (mockMsi2019) {
+        const identityHeader = "00000000-0000-0000-0000-000000000000";
+        process.env["IDENTITY_ENDPOINT"] = tokenEndpoint;
+        process.env["IDENTITY_HEADER"] = identityHeader;
+        reqheaders["X-Identity-Header"] = identityHeader;
+    }
+    let apiVersion = mockMsi2019 ? "2019-08-01" : "2018-02-01";
     let msiClientIdUrl =  msiClientId ? "&client_id=" + msiClientId : "";
-    var msiUrl = "http://169.254.169.254/metadata/identity/oauth2/token?api-version=" + apiVersion + "&resource=https://management.azure.com/" + msiClientIdUrl;
+    var msiUrl = tokenEndpoint + "?api-version=" + apiVersion + "&resource=https://management.azure.com/" + msiClientIdUrl;
     nock(msiUrl, {
-        reqheaders: {
-            "Metadata": true
-          }
+        reqheaders: reqheaders
     })
     .get("/oauth2/token?resource=https://management.azure.com/")
     .reply(200, { 
@@ -718,4 +727,4 @@ export function mockAzureARMResourcesTests() {
             properties: {}
         }]
      }).persist();
-}
\ No newline at end of file
+}
diff --git a/common-npm-packages/azure-arm-rest/azure-arm-common.ts b/common-npm-packages/azure-arm-rest/azure-arm-common.ts
index c78816ca..b9eada5f 100644
--- a/common-npm-packages/azure-arm-rest/azure-arm-common.ts
+++ b/common-npm-packages/azure-arm-rest/azure-arm-common.ts
@@ -366,11 +366,16 @@ export class ApplicationTokenCredentials {
                 // same for MSAL
                 let webRequest = new webClient.WebRequest();
                 webRequest.method = "GET";
-                let apiVersion = "2018-02-01";
-                webRequest.uri = "http://169.254.169.254/metadata/identity/oauth2/token?api-version=" + apiVersion + "&resource=" + resourceId;
+                const useMsi2019 = process.env.IDENTITY_ENDPOINT && process.env.IDENTITY_HEADER;
+                const apiVersion = useMsi2019 ? "2019-08-01" : "2018-02-01";
+                const tokenEndpoint = useMsi2019 ? process.env.IDENTITY_ENDPOINT : "http://169.254.169.254/metadata/identity/oauth2/token";
+                webRequest.uri = `${tokenEndpoint}?api-version=${apiVersion}&resource=${resourceId}`;                
                 webRequest.headers = {
                     "Metadata": true
-                };
+                };                
+                if (useMsi2019) {
+                    webRequest.headers["X-Identity-Header"] = process.env.IDENTITY_HEADER;
+                }
 
                 webClient.sendRequest(webRequest).then(
                     (response: webClient.WebResponse) => {
@@ -703,4 +708,4 @@ function getJWT(url: string, clientId: string, tenantId: string, pemFilePath: st
 
     var token = jwt.sign(jwtObject, pemFileContent, { algorithm: 'RS256', header: additionalHeaders });
     return token;
-}
\ No newline at end of file
+}