Unable to link my NNID to any Nintendo Account. : r/3DS

My Nintendo

How To Make An Out-Of-Region Nintendo Account For Switch - Guide - Nintendo World Report

Nintendo Switch digital games can only be played on one console at a time - Polygon

Nintendo Accounts Will “Help Ease the Transition” to Switch 2, Says Nintendo Exec

Nintendo wants a “smooth transition” to their next-gen console through Nintendo Accounts - Meristation

How To Transfer Your Fortnite Account Between Nintendo Accounts - Guide

Nintendo Accounts will 'help ease the transition' to Switch's successor, says platform holder

Nintendo Plans 'Smooth Transition' from Switch to Next Console by Using Players' Nintendo Accounts - IGN

It's the same device and I have to do this every time I want to log into the account. What's the problem here? : r/Switch

Nintendo Switch region-free accounts: How to buy Switch games from the Japanese eShop