Why Did I Receive a Notice About a New Device Sign-In?
This notice means that your Nintendo Account was used to sign in on a Nintendo Switch console, PC or smart device that has not been previously used with your account. The notice you received includes information about the type of device, sign-in time, and sign-in location that was detected. You can also review this information through the Sign-In History in your Nintendo Account's Sign-In and Security Settings.
If you are concerned that an unauthorised user may have accessed your Nintendo Account, please review our recommendations in the Nintendo Account Recovery Process to update your password and protect your account.