We have noticed that if a user has accepted a work request, but suddenly removes it from his list ("Remove it from my list"), the Project Owner of the project that task was belonging to doesn't receive any notification (Workfront, not necessarily email).
This is a big issue for us, as we cannot expect a Project Owner to have to continuously scan the task allocations in his project plan to ensure nobody has removed himself from a task.
This should be a standard Workfront notification to help the Project Owners and ensure assigned tasks don't suddenly become un-assigned without a notification to be sent.
Thank you