Set Up Outlook to recieve and send Pacbell.net email

1. For some reason, Outlook (Outlook 365) has stopped getting email from whatever server AT&T uses.
2. I had it set up as an IMAP account.  My spouse's Outlook stopped working on or about the same time (8/22/2022).  Neither of us changed the setup (spouse doesn't know how, I know I haven't messed with it).
3. I created a secure email key - what I believe I did the last time this happened.  Didn't work as a password.
4. On a different computer, my spouse has it set up as a POP mail account, using "inbound.att.net" and "outbound.att.net" as the incoming and outgoing email servers.  That still works.
5. So I tried to set up my email account as a POP account, using these inbound/outbound values.  It did not work.  I used my ATT password as well as the secure mail key I created.  Neither worked.
   I went through the same steps trying to set up the account as an IMAP account, using the inbound server (imap.mail.att.net/Port 993) and outbound server (smtp.mail.att.net/Port 465) settings.

In both situations/configurations, I get the message "The connection to the incoming [IMAP or POP] server was dropped".

Does anyone have any idea what is going wrong?

Thanks