Cross Reference between Commits and Issues

I just activate the issue tracker within one of my repositories. I also entered issues successfully. However, when I commited new code to the repository fixing a bug the corresponding issue gets resolved but in the commits list there is no cross reference to the bug as explained here: https://confluence.atlassian.com/bitbucket/resolve-issues-automatically-when-users-push-code-221451126.html

See the image for more details: