It could be that you can't close the review because no one has completed your review.
One "gotcha" customers run into is that only users with the 'Complete' permission can complete a review. It could also be that you don't have close review permission as well. You may want to review permission schemes to make sure you are permitted to take those actions within the project.
I would recommend you read Using Crucible for all the details.
If you already heard about Smart Commits in Bitbucket, know that you just stumbled upon something even better (and smarter!): Genius Commits by Better DevOps Automation for Jira Data Center (+ Server...
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