So you are trying to add an account to Thunderbird? Is that correct? What mail provider?

Hi Matt: I know I posted little information as I am so discouraged with Google. I have 2 gmail IMAP accounts set up in my laptop. One is my wife's who has started to do Facebook. Google sent us an alarm they thought some one had hacked her account, but I ignored it. After a few days the account started asking for certification (e-mail and password). I did enter it but got a message the address or password are incorrect. I changed the password and tried again. The same message and now the account will not download onto Thunderbird. It works fine from Google via the browser. After trying many suggestions, re enabling cookies, resetting with GATCHA, deleting Thunderbird and re-installing it nothing has changed other than the Thunderbird's e-mail account will not finish re-installing. I understand Google is trying to make Gmail's password a universal one for logging into all sorts of social media (as if many folks were to care). Any ideas about how to go back to the old Gmail? Any hope Thunderbird's developers will come up with a "work-around"? The second Gmail account (mine) in my laptop works fine... for now, until Google decides someone is trying to hack it

go to the troubleshooting information on the help menu drag your mouse over the mail and news account information and while the text is highlighted press Ctrl+C

Come to this forum and in a reply to this thread press Ctrl+V. That way I can see what account setup you already have.

Where Google is concerned, there are two possible setups. One is the Google preferred oAuth2.0. The other is the old style password. Thunderbird will default to the preferred method when setting up the account, but you can override that will a password. If you should is another matter.

However go here https://myaccount.google.com/security?utm_source=OGB&utm_medium=act#activity

make sure the allowed devices included your current copy of windows. (It should be there). Thunderbird should also be listed in the apps entry if the oAuth2.0 authentication has been used. Hopefully it is listed as denied and you can change that. Finally check the less secure apps entry at the bottom of the page. is should be on. Google will do their best to get you to turn it off, including to defaulting it to off in all their "security reviews", but if you want to us passwords instead of oauth2.0 then it must be one. (Mine is)

Have you enabled two factor authentication on Google? If yes you need to create an app password for Thunderbird to use. See https://support.google.com/accounts/answer/185833?hl=en