How to Link or Unlink a Google Account or Apple Account to or from your Nintendo Account
In this article, you'll learn how to link your Google account or Apple Account to your Nintendo Account, or unlink them from it.
Note:
You can also use your Google account or Apple Account to create a new Nintendo Account.
A Nintendo Account for a child cannot be linked to a Google account or Apple Account. Child accounts can be linked to a Nintendo Network ID only.
Complete these steps
Go to the Nintendo Account website and sign in to your Nintendo Account.
Select Your Info, then select Change in the "Linked Apps and Services" section to view the accounts that are currently linked to your Nintendo Account.
In the "Linked Accounts" section, select Change.
Select the checkbox next to the type of account you want to link or unlink.
Follow the on-screen steps to complete the link or to unlink a linked account