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This is a known issue and Atlassian is working on it, see this thread for more info, https://community.atlassian.com/t5/Sourcetree-questions/Cannot-login-to-bitbucket-in-order-to-use-sourctree/qaq-p/1100226.
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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