This is super old, but I just ran into this. Permissions were correct and we were all scratching our heads. It turned out there was another active sprint in the project. The "View" for the "Active Sprint" board was accounting for all the open sprints in the project. Therefore, changing the view to the sprint that you are looking for will allow you to close the sprint.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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