You just need git-credential-manager v1.14. SourceTree's embedded client comes with v1.12, which no longer works with Github. Easiest way to update is to install a current copy of the Git client separately, and then switch SourceTree over to use that ("system git") instead of its embedded client. Alternatively, you can update git-credential-manager in your embedded client by replacing its files with the newest version from Microsoft.
Supported Platforms macOS Windows We recently introduced support for additional hosting services such as GitHub Enterprise, GitLab (Cloud, Community Edition, Enterprise Edition), and...
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