Maybe if you post more information, such as POP or IMAP and all server settings.

也许如果您发布更多信息，例如 POP 或 IMAP 以及所有服务器设置。

Q: Are you using any other program that uses 'localhost' such as Apache or Nginx? If yes, then you need to switch it off. You can switch it back on after gmail token is set up.

In Thunderbird Check cookies are allowed.

• Settings > Privacy & Security
• Under 'Web Content'
• Select checkbox 'Accept cookies from sites'

Check: Access Firewall: Is Thunderbird set up as an allowed program ? Thunderbird must be set up as an allowed program otherwise Firewall may block access to internet/ports.

Check: Access Firewall: Is Thunderbird set up as an allowed program ? Thunderbird must be set up as an allowed program otherwise Firewall may block access to internet/ports.

thunderbird setting is allow all cookies and firewall work well ,my other mail login is work this isues only happen in gmail

Are you using a VPN ? Do you have any other program which is using the localhost such as Apache? People often use a program which uses localhost if they maintain eg: a website.