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

Nintendo Support: Nintendo Account FAQ

How to create and link a Nintendo account for Nintendo Switch (2022)

How to Create Nintendo User Account and Link the Account in Nintendo Switch Console?

You Can Now Enable Two-Step Authentication For Your Nintendo Account

PSA: When claiming your User ID for a Nintendo Account, you know you've done it correctly if you see this grey bar when you login. : r/NintendoSwitch

Nintendo accounts are getting hacked and used to buy Fortnite currency

Nintendo boss says new console transition will be easier than ever

How to Gameshare Between Accounts on Nintendo Switch - Nintendo Supply

How to link your Nintendo Network ID and your Nintendo Account

Nintendo Switch's transition to its successor has already started through the online account system - Meristation