It sounds like you are wanting to let someone know when an approval step in a ticket workflow, which has been assigned to them, has become active and let them take action on that step directly from the email notification. This is not something currently supported by TeamDynamix.
You might suggest a change to make this type of notification and action via a link directly in the notification message become supported in future versions of TeamDynamix. To make such a suggestion you can go to our Client Portal Home page and select the "Request a feature" button.
Please let me know if there is anything else I can do for you.