Cannot access att.net e-mail via POP3 or IMAP

My att.net e-mail stopped working about two weeks ago.  I can access e-mail via the web client but not with Outlook.  I contacted Support and was told to use the following:

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[Support] : Complete the Server Information:
Account Type - Select IMAP or POP3.
Incoming mail server - Enter imap.mail.att.net (IMAP) or inbound.att.net (POP3).
Outgoing mail server - Enter smtp.mail.att.net (IMAP) or outbound.att.net (POP3).

[Support] : Complete the Logon Information:
User Name - Enter your full email address.
Password - Enter or paste your secure mail key.
Check Remember password and Require logon using Secure Password Authentication.

[Support] : Select More Settings. 
Complete Outgoing Server info:
Check My outgoing server (SMTP) requires authentication.
Select Use same settings as my incoming mail server.

[Support] : Complete Advanced info:
Incoming server - Enter 993 (IMAP) or 995 (POP3).
Use the following type of encrypted connection - Choose SSL.
Outgoing server - 465 (IMAP and POP3).
Use the following type of encrypted connection- Choose SSL.
Select OK and then Next. Outlook will test your account info. If everything passes, select Finish.
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These settings matched what I had setup already.  After much frustration and gyrations, I finally deleted the account entirely and recreated it.  Now it's telling me that my credentials are invalid although I know that's not the case.  How does one go about resetting the password for a POP3 account?