Updated: 12-07-2018
https://store.nintendo.com/ng3/myaccount/login.jsp?logi...
Login. ... Registered indicates you have recently requested a repair or purchased a product directly from Nintendo. Most users have not previously Registered.
http://www.nintendo.com/3ds/nintendo-network-id/
Make the most of your Nintendo 3DS by creating a Nintendo Network ID. ... Those who own both Wii U and Nintendo 3DS systems will be able to use the same ID across both devices. ... We recommend that you
https://my.nintendo.com/?lang=en-US
My Nintendo, a Nintendo Account service. ... Nintendo. Sign in/Create account. Get started with My Nintendo! Create account. Sign in. Fun, free, and rewarding!
http://en-americas-support.nintendo.com/app/answers/det...
You can request a temporary password from the Wii U, Nintendo 3DS or on your PC or ... Where are you trying to sign in with your Nintendo Network ID?
https://miiverse.nintendo.net/?locale.lang=en-US
Miiverse is a service that lets you communicate with other players from around the world. It is accessible via Wii U and systems in the Nintendo 3DS family.
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