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.
For JSM June Challenge #2, share how your non-technical teams like HR, legal, marketing, finance, and beyond started using Jira Service Management! Tell us: Did they ask to start using it or...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events