Hi there @Retired2!
To know your passcode is definitely important for online access. I am more than happy to guide you through recovering this set of digits!
Since the passcode is a vital security validation for your account, you cannot view this number anywhere. You can only reset the code online, or in a retail store with valid ID. Both of those methods require you to be either an authorized user or owner on the account. To learn how to reset your code and gather additional details, please click here.
I hope this information assists with your original question. Have an amazing day and take care!
Shenoah, AT&T Community Specialist