how to enable two factor authentication on aws root account

Enabling a virtual multi-factor authentication (MFA) device-
These apps generate a six-digit authentication code. Because they can run on unsecured mobile devices, virtual MFA might not provide the same level of security as FIDO security keys. We do recommend that you use a virtual MFA device while waiting for hardware purchase approval or while you wait for your hardware to arrive.

Most virtual MFA apps support creating multiple virtual devices, allowing you to use the same app for multiple AWS accounts or users. You can register up to eight MFA devices of any combination of the currently supported MFA types with your AWS account root user and IAM users. With multiple MFA devices, you only need one MFA device to sign in to the AWS Management Console or create a session through the AWS CLI as that user.

For a list of virtual MFA apps that you can use, see Multi-Factor Authentication. Note that AWS requires a virtual MFA app that produces a six-digit OTP.

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