error receiving mail from gmail

Moving topic to the TBfA queue.

Wrt your problem, just because you're using the Thunderbird for Android email client doesn't mean you do have a thunderbird.com email address. Thunderbird the application (client) runs on your device to send, receive, sort and search your email messages, after you set up your existing email address(es) with an email provider such as Gmail, or Yahoo.

I have aa Beta subscription and trying to report a bug

The below link provides some instruction related to bug reporting for the email service. https://github.com/thunderbird/pro/blob/main/README.md

Need Help? Found a bug? Have an idea? Want to chat? If any of these apps are not behaving like it should, or you are not sure if you've encountered a bug: Ask a question on our Matrix channel: #tb-services:mozilla.org If you are certain you've identified a bug in an app and would like to help fix it: Open an issue in the relevant repo; include important information like OS, version, and steps to reproduce. Thundermail https://github.com/thunderbird/mailstrom/issues

The screen shot you posted doesn't look like its from the Thunderbird for Android mobile app. Is it gmail's app or some other mobile client?