While you try to login your AT & T (Yahoo SBCGlobal.net email) account by using email ID and password and you will get care code 205.4 yahoo mail error. That means your email ID and password is not recognized with Yahoo SBCGlobal.net account.
Here are the few this you have to do while you get care code 205.4 error
Go to AT&T mail login page
Enter correct email ID and password
Click on sign in option
In case you still get att care code 205.4 then reset your sbcglobal.net email account password and then try to login your account.
For more visit: https://allinsider.net/fix-care-code-2054-error-in-sbcglobal-mail/