Nintendo details Wii U network ID system - Polygon
Easy Ways to Install Games on Wii U: 7 Steps (with Pictures)
How to setup a Nintendo Network ID- 3ds, Wii U, and Nintendo Switch - YouTube
Unlinking NNID from a WiiU | NeoGAF
Q&A - Nintendo Network
So I wanna change my wii u region so I watch shows from netflix that only exist on other regions but if it says I can't use NNID after changing it. does
How to Find Your Nintendo Network ID - Wii U Wiki Guide - IGN
My nintendo id wont link on my wii u, i have no idea why it works on my 3ds and switch i tried changing the password but gives me the same error