[Communication]: Always use x-ms-date for Hmac

sdk/communication/communication-common/src/credential/communicationAccessKeyCredentialPolicy.ts

@@ -58,7 +58,7 @@ class CommunicationAccessKeyCredentialPolicy extends BaseRequestPolicy {
     const verb = webResource.method.toUpperCase();
     const utcNow = new Date().toUTCString();
     const contentHash = await shaHash(webResource.body || "");
-    const dateHeader = isNode ? "date" : "x-ms-date";
+    const dateHeader = "x-ms-date";
     const signedHeaders = `${dateHeader};host;x-ms-content-sha256`;
 
     const url = URLBuilder.parse(webResource.url);

sdk/communication/communication-identity/test/public/communicationIdentityClient.mocked.spec.ts

@@ -13,7 +13,7 @@ import { TestCommunicationIdentityClient } from "./utils/testCommunicationIdenti
 import { exchangeTeamsTokenHttpClient, getTokenHttpClient } from "./utils/mockHttpClients";
 
 describe("CommunicationIdentityClient [Mocked]", () => {
-  const dateHeader = isNode ? "date" : "x-ms-date";
+  const dateHeader = "x-ms-date";
   const user: CommunicationUserIdentifier = { communicationUserId: "ACS_ID" };
 
   afterEach(() => {