Secure Connection failed while using OAuth2 authentication.

Microsoft Q & A 381

Secure Connection failed error while using OAuth2 authentication in Thunderbird application. Settings are correct and using normal password it is working.

KyleXu-MSFT 26,211 Reputation points

2022-06-17T02:13:23.457+00:00

@Microsoft Q & A

From this article, we can know that if your device supported and want to use OAuth to send emails. You need to take the steps below:

Due to this thread also related to AAD configuration, I will help you add the "Azure-Ad-App-Registration" tag to this thread.
Microsoft Q & A 381 Reputation points

2022-06-17T06:00:14.483+00:00

I don't think so that all the mentioned steps are required for Thunderbird application. It supports OAuth2.
https://kb.wisc.edu/helpdesk/page.php?id=102005
Microsoft Q & A 381 Reputation points

2022-06-18T16:56:34.817+00:00

Any idea why secure connection failed error is coming as i have checked it is working in other machine.