You haven't explained why it's not working, such as error messages or screenshots of the server settings. Setting up the account would use the same steps as for any new account: - click hamburger menu, click new account and then click email and provide name and email address. Tell us more.

Hi, Thanks for the reply. I was successful in setting up my primary att.net account, I assumed the server settings would be the same for the att.net subaccount. The steps I followed were the same as in your response. Attached are screen shots. P/W is a newly generated security key. This worked for the primary acct but not for the subacct.

Dave

I am not familiar with ATT, but if this is a special secure key, I suggest omitting it when setting up the account and wait until ATT prompts you for it.

It seems like AT&T subaccounts do not have the same privileges as main accounts:

https://www.att.com/support/article/email-support/KM1009528/

Note that gmail 'family accounts' cannot be accessed by email apps like TB, so I wonder if the same applies to AT&T subaccounts. Or, maybe the subaccount has to use the secure key of the main account.

Waiting for the prompt worked! The main account was set up using the secure key but the sub account, when prompted for the password, worked with the established att password. Thanks to all who responded to get me over this hump! Dave