Can I Use an Apple ID to Link My Nintendo Account on Nintendo Switch?
Although you can create a Nintendo Account with an Apple ID, your Apple ID is not currently a sign-in option on the Nintendo Switch console. Please use a different sign-in method (email address or Google) to link your Nintendo Account to your user profile on Nintendo Switch.
If you have created a Nintendo Account with an Apple ID only, please sign in to your account from a computer or smart device and register an email address or link an additional service.