No settings to check. interesting enough, I can hit any one key for the password. It does not have to be my real yahoo password for the nagging request to disappear. Maybe has something to do with me having 3 yahoo accounts I use from my iphone 6? Just now I went to contacts and made up a name and number. It asked for password for one of my 3 yahoo accounts. I entered the letter Z. It saved the contact. I then deleted that contact. It asked for a password from one of my other yahoo accounts. I entered letter D and it removed. I have removed all 3 account from phone and have reinstalled. I also have properly I putted the correct passwords initially when promoted. Getting really old.