I used to have no problem accessing gmail until they stopped allowing less secure app access. Every since then whenever I tried to access my gmail accounts with Thunderbird I get the message "Authentication failure while connecting to server imap.gmail.com". I have done research and made sure I have all the correct settings regarding OAuth2 and cookies and whatever in both Gmail and Thunderbird. But I have never been able to get it to work. Then suddenly out of the blue I get this login screen for Google that opens in a new Thunderbird window that I haven't seen before. I mean I hadn't even upgraded or restarted Thunderbird for a very long time and it's just been opened in the background working away. So who knows what happened to make that appear. In any case, after I logged into my Google account using that Thunderbird window, and went through the million security notifications from Google about it, I was actually able to access my Gmail account at last. The trouble now is that I have several Gmail accounts. And I can only access one this way. The others still give me that authentication error. I have checked to make sure that all account settings are exactly the same, and they are. What can I do to get my other Gmail accounts working in Thunderbird? Is there anyway I can trigger Thunderbird into giving me that Google login windows for my other accounts?