Events in USER objects type not getting triggered in PFCG

Hi,

We need to send some notifications to the concern person at the time of assiging roles to the user . There is an object type USER and has events like created,cloned, deleted, roles_changed. But these events not getting triggered.

I need to trigger the workflow. How do we activate the events as the entry doesnot exits in SWE2 tooo . Is ther any other way?