Create new C# sample for signing in with a different Microsoft Entra …

[Harikrishnan-MSFT]

…account in Teams tab

[Copilot]

Pull Request Overview

This PR creates a new C# sample demonstrating Microsoft Entra ID authentication and account switching within Microsoft Teams tabs. The sample shows how users can sign in with different Entra accounts for secure, flexible access across Teams, Outlook, and Office platforms.

Key Changes

• Complete ASP.NET Core 6.0 web application with MVC architecture
• OAuth 2.0 authorization code flow implementation for Microsoft Entra ID
• Teams-specific authentication using Teams JavaScript SDK v2.34.0
• Cross-platform support for Teams, Outlook, and Microsoft Office

Reviewed Changes

Copilot reviewed 29 out of 44 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
assets/sample.json	Sample metadata configuration with Teams-specific properties
TabAuthEntraAccount/*.cs	Core ASP.NET application files including controllers, models, and startup configuration
Views/**/*.cshtml	MVC views for authentication flow and user interface
M365Agent/**	Teams Toolkit configuration for deployment and manifest
README.md	Comprehensive documentation with setup instructions and authentication flow
.github/workflows/build-complete-samples.yml	CI/CD integration for automated builds

[Copilot]

The entire Razor view content and script block are duplicated starting from line 37. This creates duplicate function definitions and DOM ready handlers, which could cause unexpected behavior and makes the code harder to maintain.

Suggested change

	</script>
	@{
	ViewBag.Title = "title";
	Layout = "_Layout";
	}
	<script src="https://res.cdn.office.net/teams-js/2.34.0/js/MicrosoftTeams.min.js"
	integrity="sha384-brW9AazbKR2dYw2DucGgWCCcmrm2oBFV4HQidyuyZRI/TnAkmOOnTARSTdps3Hwt"
	crossorigin="anonymous"></script>
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
	<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
	<script type="text/javascript">
	$(document).ready(function () {
	getAuthToken();
	});
	// Get id token.
	function getAuthToken() {
	const params = new URLSearchParams(window.location.search);
	const result = params.get('code');
	const { authId, method, hostRedirectUrl } = JSON.parse(params.get('state'));
	const baseUrl = hostRedirectUrl.split('authId')[0];
	if (method === 'deeplink') {
	window.location.href = `${baseUrl}authId=${authId}&result=${result}`
	} else {
	microsoftTeams.app.initialize().then(() => {
	if (result) {
	microsoftTeams.authentication.notifySuccess(result);
	} else {
	const error = params.get('error') || 'OAuth failed';
	microsoftTeams.authentication.notifyFailure(error);
	}
	});
	}
	}

[Copilot]

The comment mentions 'google client side token' but this is a Microsoft Entra ID authentication implementation. The comment should reference Microsoft or Entra ID instead of Google.

Suggested change

	// Get google client side token.
	// Get Microsoft Entra ID client side token.

[Copilot]

There is an extra space in the comment 'Get id token.' It should be 'Get id token.' or more descriptively 'Get ID token.'

Suggested change

	// Get id token.
	// Get id token.

[Copilot]

The appsettings.json file contains empty placeholders for sensitive configuration values (ClientId, ClientSecret, RedirectUri) that will be committed to source control. Consider using appsettings.Development.json or environment variables for these values, and add a comment indicating these are placeholder values that must be configured.

[Copilot]

Creating a new HttpClient instance directly can lead to socket exhaustion issues. The class already has IHttpClientFactory injected but it's not being used. Consider using _httpClientFactory.CreateClient() instead of new HttpClient().

Suggested change

	var client = new HttpClient();
	var client = _httpClientFactory.CreateClient();

[Copilot]

Creating a new HttpClient instance directly can lead to socket exhaustion issues. Consider using _httpClientFactory.CreateClient() for this Graph API client as well.

[Harikrishnan-MSFT]

Build Pipeline -
https://github.com/OfficeDev/Microsoft-Teams-Samples/actions/runs/17456496142

[Pawank-MSFT]

looks correct, Approving!