I changed the password several times and I'm sure I'm entering right username/password combination
Hello! Try using the OAuth feature:
The problem was solved in this thread
https://community.atlassian.com/t5/Sourcetree-questions/Login-popup/qaq-p/735716?utm_campaign=accept_as_solution_reminder&utm_content=view-answer&utm_medium=email&utm_source=atlcomm#U736918
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