How get taskID from task context for send it in service param?

What product/components do you use and which version/fix level?

MWS 10.5

Are you using a free trial or a product with a customer license?

Customer license

What are trying to achieve? Please describe in detail.

I want to know the taskID from my task from task event for send that information to a service.

I have a task. When MWS assigns a user from the task, a event is fired. This event invokes a service from IS. But I need to send the TaskID from my task because my flow service need it.
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The problem is I cant see the taskID as variable in the taskInfo Document:

How can I get the taskID value?