locked out of sbcglobal.net account and ATT accounts because can't get 6 degit code

I am a retired AT&T manager. I am unable to loginto my sbcglobal.net account or, my ATT account to pay my bills. I do not get the 6 digit code that is needed for secondary authorization. I have tried several of the fixes listed, but they have not worked. I am not using an APP, I am going in thru Currently or Googling Yahoo Mail. Can anyone help?

Thank You