Azure AD B2C MFA custom voice message on calls

Question

In AAD B2C, I'd like to know if there is some way to customize the voice message on MFA phone verification with call option instead of SMS? Because the default one talks about Microsoft while the end user of our app has non idea he's dealing with Microsoft. So he might just hang up thinkin it's a scam. Believe me, on a 400k users base, there's a lot of chance it will happen.

I use custom policies with the "PhoneFactor-InputOrVerify" TechnicalProfile from the starter pack, "setting.authenticationMode" set to "mixed". So when the user chooses "Call me", it gets a phone call.

Answer 1

@Patrice Côté

Thank you for your post and I apologize for the delayed response on this!

From your issue, I understand that you're looking for a way to customize the MFA phone verification voice message within your B2C tenant, similar to that of the Azure AD Multi-Factor Authentication - Custom voice messages feature.

As of right now, this currently isn't supported within B2C, and our engineering team is aware of this. However, there's a chance you can add your tenant to an allow-list and if you'd like to see if this is possible, please email me with the info below. I'll enable a one-time free technical support request for your subscription so you can work with our support engineers on this.

<<Removed email instructions>>

Additional Link - User Voice Enable Custom Greeting Prompts for Azure B2C MFA Phone Call

If you have any other questions, please let me know. Thank you for your time and patience throughout this issue.

Answer 2

HI, see this doc:

https://learn.microsoft.com/en-us/azure/active-directory/authentication/howto-mfa-mfasettings#phone-call-settings