How to set up Nintendo 2FA on your Switch account

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How to Set up Nintendo Switch Two-Factor Authentication

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Notification of the Discontinuation of the Option to Sign in to a Nintendo Account by Linking a Facebook or Twitter Account : r/NintendoSwitch

Nintendo has acknowledged reports of unauthorised account logins this month and said it's investigating the situation. : r/NintendoSwitch

Nintendo - Authy

Switch owner? Go enable two-factor authentication for your Nintendo account