Well, it's quite obvious to get confused because the original sbcglobal email website is no longer available for the users. Even, now you will not be able to create a new account with the domain @sbcglobal.net (due to its migrations).
But, you can access your previous sbcglobal.net mail account from the att yahoo login page. For this, open the web browser you are using, and type https://currently.att.yahoo.com/
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