When I try to add my Github account on sourcetree using HTTPS and Basic authentication it throws me an Error saying - Failed to check login for user. Authentication required.
Did you try to log out and then log back into your GitHub account?
I know it sounds weird, but I had a somewhat similar problem (requesting authentication when I wanted to push changes) and that's what I did after seeing that GitHub recommended this kind of little handling.
(Potentially same kind of issue as Github Personal Access Token not working for Basic Auth)
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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