Thunderbird fails access ATT - Secure mail being used

Hello, about 3 days ago, ATT changed their req's for access from Thunderbird. Now Tbird requires a secure mail key. I created on this morning. Used it as my password and It connected and worked. Successfully sent an email too. Closed Thunderbird and rebooted and now Tbird is failing. I see these messaged in the Error Console. Running W11. and W defender. Please help. Error console attached as image.