I cannot set up Outlook with my Att.net settings. I copied the same settings as my wife's and hers works. Please help

What PC? it has name, and model number.
what OS? XP?
how is unstated pc connected to the internet, wires or wireless? and is that working, right. can you use a browser and get to att.net?
http://start.att.net/


Microsoft has dropped, support for XP and Vista now
and for outlook.
why not us Mozilla thunderbird with your login credentials to Att.net
or use att.net, web mail there.

here is the web mail portal (yes att.com makes it hard)

https://loginprodx.att.net/commonLogin/igate_edam/controller.do?TAM_OP=login&USERNAME=unauthenticated&ERROR_CODE=0x00000000&ERROR_TEXT=HPDBA0521I%20%20%20Successful%20completion&METHOD=GET&URL=%2FFIM%2Fsps%2FATTidp%2Fsaml20%2Flogininitial%3FRequestBinding%3DHTTPPost%26PartnerId%3Dhttps%3A%2F%2Flogin.yahoo.com%2Fsaml%2F2.0%2Fatt%26.lang%3Den-US%26Target%3Dhttps%253a%2F%2Fmail.yahoo.com%253f.lts%3D1492947802%3Ftucd567%3Dw&REFERER=http%3A%2F%2Fstart.att.net%2F&HOSTNAME=loginprodx.att.net&AUTHNLEVEL=&FAILREASON=&PROTOCOL=https&OLDSESSION=

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I am really sorry to hear that, if you have done all the steps, then I would highly suggest to contact AT&T because they have a system that will just activate your outlook on their end, I believe they will just unblock something on their system then you are good to go.

Here's the contact number for AT&T phone support.

1-800-288-2020