Once you follow all the frurnished steps in a correct way, then you can easily access my att Yahoo email account to separate it. Actually, for it, you have to search for the official AT&T site login in a web browser. Hereafter, you have to open AT&T site and then go for sign in link. Next, you can navigate profile section from my ATT to separate account. https://www.numbersupportcustomerservice.com/blog/access-my-att-email-account/