Microsoft: Stop Using Phone-Based Multifactor Authentication

Smiling woman using smartphoneThe best option? Hardware security keys.

By Rick Richardson

Microsoft is urging users to abandon telephone-based multifactor authentication (MFA) solutions like one-time codes sent via Short Message Service (SMS) and voice calls and instead replace them with newer MFA technologies, such as app-based authenticators and security keys.

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The warning comes from Alex Weinert, director of identity security at Microsoft. For the past year, Weinert has been advocating on Microsoft’s behalf, urging users to embrace and enable MFA for their online accounts.