Password to access gmail mails fails.
I have changed the password for my gmail account with Google. Thunderbird asks me to enter the password but the login fails.
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Your picture indicates the authentication method is 'normal password'. Change it to OAuth2, for the incoming and outgoing, in Tools/Account Settings, and check that cookies are accepted in TB Preferences. Restart TB and enter the account password in the OAuth window to allow TB access.
I had the same problem with a GMail account. After changing the authentication method to OAuth2 I got a popup requesting permission for Thunderbird to access the GMail account. Once that was done it started working again.