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Legacy 2FA provides a second layer of security for your Atlas account. If you have 2FA enabled for your account, after you enter your username and password, you are prompted for a six-digit time-sensitive verification code. This code is sent to a separate device, such as a mobile phone or security token, that you can read and enter into Atlas and complete your login.
If you login using your Google account:
Google manages your 2FA. You can't use Atlas multi-factor authentication and won't be prompted for an Atlas 2FA verification when you log into Atlas. Google should verify your identity using Google 2-Step Verification.
To learn more about organization settings, see Change Organization Settings.
Atlas includes the following sources for 2FA verification codes:
Since legacy 2FA is deprecated, if you have legacy 2FA enabled and you lose access to your 2FA device, you must set up multi-factor authentication to replace 2FA.