Keep a valid mobile phone number or email address on your account in case you ever lose your password and remove them from accounts you don’t recognize or use.
https://help.yahoo.com/kb/SLN2058.html
Add or remove an account recovery method | Yahoo Help - SLN2058
Don’t get locked out of your Yahoo account! Find out how to manage your recovery phone number and email address on accounts you use and recognize.help.yahoo.com DressAfford lace coverd with long sleeve items to wear