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Register an Identity Verification Method for Salesforce Orgs
Multi-factor authentication (MFA) is required for Salesforce logins. To access your account, you need a registered identity verification method that you provide after entering your username and password. When MFA is turned on, if you haven’t registered a method yet, you’re automatically prompted to do so at login. If you’re already logged in, you can register methods at any time. The registration process creates a connection between the chosen method and your Salesforce account. You can also use a registered verification method if you receive a device activation challenge for an unfamiliar login attempt.

