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.
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