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When trying to set up Gmail account using OAuth2 on fresh Thundirbird install I can't get properly authenticated despite providing correct credentials.

With help of the Thunderbird wizard I get all the servers and a new window for OAuth2 is displayed. I log in and two 2 step authentication after which I'm presented with information that I'm about to allow thunderbird to receive, send email etc.

After I click allow the thunderbird displays "Authentication failure while connecting to server imap.gmail.com".

  • This is the only actual solution which gives anything close to a "reason", other supposed "answers" simply involve uninstalling Thunderbird. It's not a version problem at all. – Thufir Feb 27 at 13:13
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Solution suggested in this thread solved my problem.

It seems, that gmail fails authentication when it detects useragent of inbuilt thunderbird browser. The solution is to set"general.useragent.compatMode.firefox" property to true. This is done with config editor (Edit-Preferences-Advanced-General-Config Editor.)

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  • Correct. Only correct answer I found, re-installing Thunderbird isn't required. – Thufir Feb 27 at 13:14
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Or update to 68.2.1 for the fix.

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I've solved this problem. I also had an issue with this and it took me a long time to figure it out so I made a video how to fix it and you can find the SOLVED video here on YouTube: https://youtu.be/bu3QkC9HhVw This was a very unique issue when you have had multiple password updates in Gmail and Thunderbird is storing the old passwords that are conflicting with your new password which may be inhibiting you from entering your new password into Thunderbird.

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  • Welcome to Super User! Please quote the essential parts of the answer from the reference link(s), as the answer can become invalid if the linked page(s) change. – DavidPostill Apr 6 at 7:34
  • You may need to delete old passwords in Thunderbird when updating the passwords in Gmail... It is a bit hard to find where those passwords are stored though so you need to watch the video that shows exactly how / where the passwords are stored... As per previous: This was a very unique issue when you have had multiple password updates in Gmail and Thunderbird is storing the old passwords that are conflicting with your new password which may be inhibiting you from entering your new password into Thunderbird. – Mike Smith Apr 7 at 8:32

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