This started two days ago and I've been searching the web for solutions, but all I get are outdated solutions that won't wonk on my current Thunderbird version 115.4.2. When I open the Thunderbird window, two smaller windows open asking for me to enter the passwords for the two att.net accounts. I assumed they meant my AT&T passwords but when I entered them they came back as "failed". I then tried the "master" password I put in several years ago (which I have never needed to re-enter) and that didn't work either. I am attaching a photo of what comes up when I open Thunderbird. You can see the two boxes that want me to enter the passwords but I have no idea what to enter. If it wasn't my master password or my AT&T passwords for each account, it must have been something I used when I installed Thunderbird ten years ago that somehow got deleted or lost. I downloaded another email client to use temporarily until I get my Thunderbird fixed so I can not get my emails, but I hate this new client for a lot of reasons that are irrelevant here. I hate this new client and I need my Thunderbird back. Can anyone give me any idea on how to find the right password or to change the password so it will work again?