Integrating TeamCity with GitHub
TeamCity integration with the GitHub issue tracker can be set up separately or as a part of TeamCity integration with the GitHub source code hosting service.
When setting up integration with GitHub (see general information here), in addition to the repository URL and other general settings, you need to configure authentication and specify the issue ID pattern.
TeamCity allows you to select whether you want to connect to GitHub anonymously or to be authenticated via a personal access token (PAT).
warning
Authentication via login/password is deprecated by GitHub. We highly recommend that you authenticate with access tokens instead.