And if that wrong it will fail again or prompt you again. But an app will either just fail with some error message or prompt you for the proper password. Webmail behaves like you described, i.e., possibly redirecting to other login pages. You might have configured an app incorrectly but there is no setup in the webmail. On the other hand you say 'it just goes from Yahoo sign in, to AT&T' which implies to me something a browser would do, not a app. On the one hand you say 'add my email account on my phone mail' which I take to mean you are setting up the phones mail app. Are you or are you not trying to set up the mail app in your phone as opposed to simply trying to use a browser to access the att/yahoo webmail (which makes no sense to me, i.e., using webmail on a phone). Sorry that's the part I still don't understand.

Well when trying to re add my email account on my phone mail, it just goes from Yahoo sign in, to AT&T entering the email and password, asking me to reset my password, and then back to the AT&T login.

Yahoo mail app mac desktop