Tasks not shown to technicians

Tasks not shown to technicians

Hi 

i have an incident request assigned to a technician from a local group created by us which called "Help Desk" and this ticket needs some tasks from a technicians from another group called "systems" but when we add the tasks to the technicians in "Systems" group the ticket does not appear in there accounts(systems group) at all and no notification was sent to them indicating that there is tasks related to them in a cretin  ticket and needs to be followed 

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