first of all check if you can see this sprint in jql:
use sth like this: sprint="Name of the important sprint for you"
Here you have all information about ending a sprint:
It shows up as having no issues in a search query and it auto completes for Sprint fields and is show as active. However the Ending Sprints doc asks me to select an Agile drop down which I do not have:
Click the Complete Sprint button.
It does not show in the Backlog view like my other Active Sprints.
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