Line Manager not able to submit Employee's task

Summary:

HI ,

As part of a business requirement, we created a checklist task with performer as 'Worker'. The requirement is, if the Worker couldn't perform the task, the line manager should be able to perform the task under his login for the employee.

The Line manager can view the task from My Client Group→ Journeys → Query the employee.

However, there is no "Done" button visible to the Line Manager. How to make it visible to the line manager?

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