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

Nintendo Support: Nintendo Account FAQ

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

Nintendo Accounts at over 330 million, will be foundation for Nintendo's lasting relationship with consumers

Nintendo Accounts now support passkeys

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

Nintendo boss says new console transition will be easier than ever

Using One Nintendo Account On 2 Switches Is Tricky, So Here's The Best Way To Do It

How To Change Email In Nintendo Account

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

How do I link my mobile Sky account to my Nintendo Switch account? — Sky Beta Help Center