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In the example below, you can see the tooltip for BPV-42.
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User can't edit task - reason displayed
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When a task can't be edited, the reason is provided in the tooltip
missing permissions
in integration (connected tool) Jira (a user doesn't have sufficient Jira permissions to edit tasks)
in a box (a user is a viewer only - can't edit tasks)
The box is closed or archived
the box you're in is closed/archived
you are in a portfolio box but one of its children is closed/archived (the resources module of the portfolio aggregates tasks from all child boxes)
show overall assignment - a task from a different box (overall assignment shows all tasks assigned to a resource. Tasks in the scope of the box you are in can be edited normally. Tasks assigned to the resource in other boxes can't be edited)