Task scheduling is only available for issue-based calendars. (Project, JQL, Filter)
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To open the backlog, call the calendar dropdown and click "Schedule Issue."
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A list of tasks available for planning should appear in the window that opens.
If there are no issues in the backlog,
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Make sure that in your project, the fields on which the calendar is built are editable.
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Make sure all quick filters are turned off.
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Make sure there are tasks in the project :)
3. Drag an issue to the calendar grid.