https://en-americas-support.nintendo.com/app/answers/detail/a_id/22448
You can log in with your Nintendo Account on multiple consoles.
There can be one primary system and multiple secondary.
While using the primary console, any user account on the console can play the downloadable content you have purchased.
While using the primary console, you do not need to have an active Internet connection
You can change which Nintendo Switch console is your primary console but you must first deactivate the current primary console.
While using a non-primary console, you must have an active Internet connection to play downloadable content.
If you lose your Internet connection while playing downloadable content on a non-primary console, your game will pause after a certain amount of time; however, once you connect online again, you will be able to resume from the point you left off.
While using a non-primary console, downloadable content can only be started by the user that purchased the content.
When using downloadable software on a non-primary console, your game will pause if your Nintendo Account is used to access downloadable software on any other Nintendo Switch console.
Nintendo now allows deactivating your primary console through a website, no need to call them.
Off-device deactivations can be done by visiting accounts.nintendo.com, selecting "Shop Menu", and then "Deactivate Primary Console".
You can log in with your Nintendo Account on multiple consoles.
There can be one primary system and multiple secondary.
While using the primary console, any user account on the console can play the downloadable content you have purchased.
While using the primary console, you do not need to have an active Internet connection
You can change which Nintendo Switch console is your primary console but you must first deactivate the current primary console.
While using a non-primary console, you must have an active Internet connection to play downloadable content.
If you lose your Internet connection while playing downloadable content on a non-primary console, your game will pause after a certain amount of time; however, once you connect online again, you will be able to resume from the point you left off.
While using a non-primary console, downloadable content can only be started by the user that purchased the content.
When using downloadable software on a non-primary console, your game will pause if your Nintendo Account is used to access downloadable software on any other Nintendo Switch console.
Nintendo now allows deactivating your primary console through a website, no need to call them.
Off-device deactivations can be done by visiting accounts.nintendo.com, selecting "Shop Menu", and then "Deactivate Primary Console".
