Att.net Email Password Reset Help

I have had an "att.net" email for over a decade. About 3 weeks ago my email kicked me off and then started saying my password was incorrect.

*This is a free email account, I do NOT have any att services connected to this email.* However, I have a backup email associated with my account and believe my phone number is also associated with the account.

My question is, when I request to reset the password it takes me to security questions that I have no clue what the answers are (I set up this account when I was like 12 years old, things have changed since then). I do not get the option to use a temporary passcode. WHY is this happening?? This email is my primary email - literally everything I subscribe to, pay bills with, etc is linked to this email and now I can't access it. 

Important to note I am somehow still logged in to the att.net email on my computer. So if a temporary passcode can be sent  that way, I would LOVE to be able to use this option.

Any help is much appreciated.