Personalized MFA Emails in Azure B2C: An Overview

Resolving Custom Email Issues in MFA

A lot of customization possibilities are available for user authentication flows with Azure B2C, including the capacity to send personalized emails for different kinds of situations. Everything may proceed smoothly when creating custom policies to allow local accounts sign-in and forgot password flows, including managing conditions of use and sending personalized emails using SendGrid.

Nevertheless, a frequent problem occurs when the Microsoft tenant email is used instead of the custom email for the verification code during the Multi-Factor Authentication (MFA) process during sign-in. This article examines the problem and offers suggestions for a workable solution.

Command	Description
<BasePolicy>	Specifies the base policy that Azure AD B2C custom policies will inherit from.
<ClaimsTransformations>	Includes changes for claims, like the creation of personalized email subjects.
ClaimsTransformation	Describes the transformation of a single claim, including the input and output claims.
SendGridClient	Sets up the SendGrid client so that emails can be sent.
SendGridMessage	Generates a message object in order to use SendGrid to send an email.
AddTo	Enables the recipient to be added to an email.
SendEmailAsync	Uses the SendGrid client to send the email message asynchronously.

Comprehending Azure B2C's Custom MFA Email Implementation

The aforementioned scripts are made to make it possible to send personalized MFA verification emails to users during the Azure B2C sign-in procedure. Setting up the custom policy XML for Azure AD B2C is the first script's task. The tag in this XML is used to inherit from the base policy, guaranteeing that all basic configurations are present. Claims transformations are contained in the section. For example, the element can be used to create a unique email subject. The MFA email content can be dynamically customized thanks to these modifications.

The second script uses SendGrid to send the customized email and is a C# Azure Function. The property specifies the queue that starts this function. It uses to initialize the SendGrid client and to create an email message. Emails are sent asynchronously using the SendEmailAsync method, while adds the recipient. The problem of default Microsoft tenant emails being sent during the sign-in flow is fixed by this solution, which guarantees that MFA emails are sent with the specific content specified in SendGrid.

<TrustFrameworkPolicy xmlns="http://schemas.microsoft.com/online/cpim/schemas/2013/06">
<BasePolicy>
<PolicyId>B2C_1A_TrustFrameworkBase</PolicyId>
</BasePolicy>
<BuildingBlocks>
<ClaimsTransformations>
<ClaimsTransformation Id="CreateMfaEmailSubject">
<InputClaims>
<InputClaim ClaimTypeReferenceId="email" TransformationClaimType="email"/>
</InputClaims>
<OutputClaims>
<OutputClaim ClaimTypeReferenceId="email" TransformationClaimType="email"/>
</OutputClaims>
</ClaimsTransformation>
</ClaimsTransformations>

using System.Threading.Tasks;
using Microsoft.Azure.WebJobs;
using Microsoft.Extensions.Logging;
using SendGrid;
using SendGrid.Helpers.Mail;
public static async Task Run([QueueTrigger("mfa-email-queue")] string email, ILogger log)
{
var client = new SendGridClient(Environment.GetEnvironmentVariable("SendGridApiKey"));
var msg = new SendGridMessage()
{
From = new EmailAddress("no-reply@yourdomain.com", "Your Company"),
Subject = "Your MFA Verification Code",
PlainTextContent = $"Your verification code is {email}",
HtmlContent = $"<strong>Your verification code is {email}</strong>"
};
msg.AddTo(new EmailAddress(email));
var response = await client.SendEmailAsync(msg);
}

More Detailed Methods for Personalized MFA Emails in Azure B2C

Make sure that the orchestration steps in your custom policy are correct when customizing MFA emails in Azure B2C. To properly manage sending MFA emails, this entails designing and setting additional steps in the user journey. Including a new orchestration step in the sign-in policy specifically for email verification is one useful strategy. In order to initiate the email sending process, this step should make use of the claims transformation and technical profile.

Furthermore, it's critical to debug and track the user journey to make sure the right APIs and email templates are being called. It is possible to monitor and identify problems with the implementation of custom policies by using tools such as Application Insights. This makes it possible to monitor and debug in real time, guaranteeing that personalized emails are delivered during the MFA procedure in the correct manner.

1. How can I set up a personalized email template in Azure B2C with MFA?
2. To build and maintain custom email templates, use or another email service, and then incorporate it into your B2C custom policies.
3. What stages of orchestration are necessary to send personalized MFA emails?
4. Incorporate a specific in the sign-in policy for email verification.
5. How can I make sure the personalized email is used when logging in?
6. In the relevant orchestration phases, update the user journey to include a reference to the custom email template.
7. Why is MFA still using the Microsoft email default?
8. Verify if the and template are accurately cited in the custom policy.
9. How can I troubleshoot Azure B2C custom email sending issues?
10. To track and diagnose the email sending process and user journey, use .
11. Can I use email providers other than SendGrid?
12. Yes, a variety of email providers are supported by Azure B2C; however, you must properly configure them in the custom policy.
13. Which claim changes are required while creating personalized MFA emails?
14. Determine the that are required in order to dynamically produce and format the email content.
15. Is it feasible to alter the email address that is sent?
16. Sure, make sure to include the sender address in the policy and to include it in the email service setup.
17. How can I test the personalized email flow with MFA?
18. For verification that the custom email is sent appropriately, use test accounts and start the sign-in procedure.

It takes knowledge of and accurate configuration of a number of components, including orchestration processes, claims transformations, and integrating third-party services like SendGrid, to configure Azure B2C to send custom emails for MFA authentication. Custom emails can be reliably delivered throughout the sign-in phase by adhering to strict criteria and utilizing the right debugging tools, even though the process can be complicated. In addition to enhancing security, this offers a streamlined and branded authentication procedure that boosts user experience.