https://techcrunch.com/2022/09/20/nintendo-ending-support-account-login-facebook-twitter/

Nintendo is ending support for account logins through Facebook and Twitter on October 25, the company announced on Tuesday. After that date, players won’t be able to sign in or create a new Nintendo Account using a Facebook or Twitter account. Nintendo says players will still be able to log on or create a new Nintendo Account with their Google or Apple account.

If you’re asked to sign in again after October 25, you will need to enter the email address or username associated with your Nintendo account. If you haven’t set your Nintendo account or forgot your password, you will have to select “Forgot your password?” on the Nintendo Account sign in page and follow the instructions. If you don’t have access to your registered email address, you won’t be able to change the email address yourself and will have to contact Nintendo customer support.