After you enter your email & password starting from File/New/Existing Mail Account, click Continue and then Manual config. on the next screen. Select IMAP and enter the rest of the settings.

Or, go offline from File/Offline/Work Offline to bypass the wizard lookup.

https://www.att.com/esupport/article.html#!/email-support/KM1086159?gsi=lqzqLjk

Use a secure mail key in TB instead of the regular account password.

https://www.att.com/esupport/article.html#!/email-support/KM1240308?gsi=MOXN5fs

I did the manual config and IMAP was not an option. Do the 2 links to att support have anything to do with this. if so what as I have read both and don't see a connection between the secure mail key and IMAP. Thank you for your reply. is it possible I don't have the most recent TB I'm on 52.9.1 (32-bit)

See the attached picture for an example of the account setup screen after selecting Manual config. As you can see, IMAP or POP are available for the incoming server type. Incoming: imap.mail.att.net on port 993, SSL/TLS, authentication = normal password, User name = email address. Outgoing: smtp.mail.att.net on port 465, SSL/TLS, authentication = normal password, User name = email address. Use the secure mail key in the Password box.

The secure mail key is needed whether you use POP or IMAP access.

These settings should work on any version of TB.

This is not what I am seeing but have to learn to do screen shots before I can show that I only get the pop3 part. I will also have to go into att.net to set up a secure mail key. Hopefully some time tomorrow all this will come together. Thanks so much for the help.

Got the screen shots. As you can see I'm not getting what you are. I'm going to see if setting up the security key works although I'm not very trusting of what att.net is up to with this.

Well this is a fine mess. After much difficulty set up the secure key however, as you can see from the screen prints I can't access this mail box at all now.

Those are the correct settings for POP accounts, but if you wish to use IMAP, click the v next to POP3 in the Incoming: box and select IMAP. I don't know why you get the error when the secure mail key is entered for the password, although sometimes antivirus programs interfere with secure email connections. If you have such a program, turn it off while you set up an account.

Finally! It worked with one little tweek - after selecting the IMAP from the drop down (Which I completely missed) I still had to add the IMAP address manually as it did not auto fill when I selected IMAP. Thank you for your patients. Now I hopefully can get email synced to my laptop.