MC611686 · Identity Service, SharePoint Development Services
From Microsoft Corporation
Technical Bulletin MC611686 · Published Jun 27, 2023
Message Summary
Voice calls have proved to be the least secure authentication method; there are far better ways of performing multifactor authentication (MFA), including Microsoft Authenticator (which offers both MFA and Passwordless options), or more secure phishing-resistant methods like Windows Hello for Business and FIDO2 security keys. Although we have encouraged everyone to move away from traditional MFA methods (such as SMS and voice), we understand that some of you are dependent on these methods in order to use MFA. To address this need, we are making an improved version of our voice call method available – introducing “voice one-time password (OTP)”. This method will be combined with the SMS authentication method and as such have two delivery methods (SMS and voice OTP) to allow for delivery method optimization.
When this will happen:
Starting August 2023
How this affects your organization:
Users in your organization who rely on SMS will have this new optimized channel.
What you can do to prepare:
We encourage you to keep recommending users to use the Microsoft Authenticator app to get an even better user experience.
