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Log in to User profile and go to Authentication > Multi-factor authentication.

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Here you can either enable Multi-Factor Authentication for all services, or (if available) you can expand the menu and select whether you want MFA to be enabled for each service individually. Then confirm by clicking Save settings.

You will need to sign in again and perform Multi-Factor Authentication to confirm this action. From now on, each new login to your selected services will require Multi-Factor Authentication.

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