I can't change my security to 2FA
I can't change my security to 2FA on one of my yahoo accounts.
NEIL MACALI shared this idea
Due to contractual agreements and the nature of your issue, you'll need to contact AT&T for a resolution. When contacting AT&T support, it is very important that you provide your full AT&T email address so that they are able to successfully locate your account in their system. Here's how to contact them: https://help.yahoo.com/kb/account/sln25426.html