Hi, and thank you for asking your question.
Do you get any error/message when trying to access your Gmail account using Thunderbird now?
May I set up a quick remote session, which will allow me to connect directly to your screen and assist you with this issue?
Please reply back to me below. Thank you.
The remote session will come at NO extra charge. Do let me know.
Please reply back to me on this page itself. Thank you.