ATT/Yahoo internal redirect at sign in
It's been a week and no email access. At sign in - the user name and password is recognised and accepted. No error message, no denial of access. The 'sign in' screen redirects 4-5 times. Including: "oidc.idp.??? , "sign in", "sign out", ATT.Yahoo.Att.net, and more - redirect is fast, other addresses are missed. After hours and multiple agents - Att support - I'm told to call Yahoo, "work it out with them". With Yahoo - I'm told it's an Att problem because the email address is sbcglobal.net. Attempts to login get the same result - Incognito, Chrome, Firefox, ATT.com, Yahoo.com, Safari. Apple has accessed the device - viewed this sign in process and the redirect. Apple identifies it as an ATT/Yahoo problem. HELP!