When you are admin and create a scheduled task in your admin panel, this scheduled task will not be visible to subscribers.
When you try to activate a task in a subscription, and you click activate, but afterwards the task is still inactive, this is because the subscription or the domain was suspended or deactivated.
For more answers, please describe your issue in more detail. It is normally insufficient to only state that something does not work. What exactly are you clicking, what do you expect to happen and what has really happened instead?