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If you are facing the issue with Sourcetree, that you can not push to your Azure DevOps repository, because it fails with the following error:

Pushing to https://bitfoxhungary.visualstudio.com/someProject/_git/someProject
fatal: unable to access 'https://bitfoxhungary.visualstudio.com/someProject/_git/someProject/': The requested URL returned error: 403

Copy the URL returned by the error, and browse it with a web browser.

If needed, provide your login credentials in the browser, then try again.