Often, it's a simple matter of setting up your email client. If you're using an old email client, check that your account settings are correct. If you're using a third-party email client, check that it is compatible with AT&T. If you're using a legacy mail server, make sure it's set to IMAP. By doing this, you'll be able to access your email and get the ATT care code 205.4 that you're after.
See also - https://techone8.com/get-rid-of-att-care-code-205-4-with-easy-fixes/