authentication failure while connecting to server imap.gmail.com
Since yesterday I have had authentication failure for only one of my accounts on Thunderbird. All the other accounts including the ones on Google work and I can connect to. Only this account suddenly has stopped and when I click on it I get the above message. It is still working when I use Gmail on my browser.
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If you recently updated to Thunderbird 91.8.0, see https://support.mozilla.org/en-US/kb/automatic-conversion-google-mail-accounts-oauth20