@Arun Priya 

it should work fine.

Did you check my other points?

1) the assigned to user should be active and not locked out

2) that user should have notification preferences enabled in Next Experience

3) that user should have email field populated in sys_user record

Try adding your user profile in Who will receive and see if it works

If my response helped please mark it correct and close the thread so that it benefits future readers.