Perhaps if you can report the whole error message verbatim. I am pretty sure the important information comes after the word failed.

Google have traditionally been pretty good at offering a reason for their actions.

here's the whole of my error message...and no matter what I click, it won't go away. I tried clicking "Enter New Password" and "Retry" and it just keeps coming back...only "Cancel" button works it says, "Login to account "lynn@xxxxxx.com" failed (bold lettering) underneath is unbolded lettering is says, "Login to servier impa.googlemail.com with user name lynn@xxxx.com failed. It won't download any recent emails.

i have this problem too, it just started in april 2025. i have updated to the latest version of thunderbird. google kicked other emails that i used less often out a long time ago because google didn't like the the lack of security or encryption that tb had, but i figured tb probably fixed that a long time ago. any idea on what to do? or is tb just kicked off google in its entirety now? bc