Hey Artem.
At first glance i'd guess that the user planning (presumably you) does not have either
Permissions which are configured on the Team Configuration page
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Only one more question, can I plan my stories/subtasks that is already in sprint (without epics, not in backlog)?
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Currently you can not plan on "issues" in the sprint.
But don't worry. That is a feature we are working on and hope to release "soon(tm)"
Technically you can "refine" plan items down to an issue (this is done by clicking the issue and using the SingleSelect search in the top-right corner). But we're working on a more complete solution for planning sprints, but you should definitely check it out.
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