Employee not receiving email notification if the user is inactive

We have enabled delegation feature in our oracle cloud expense module. All the employees are delegated to a group of designated employees. All the employees have an user account but suspended.

Now when a delegate creates an expense report on behalf of the expense owner, expense owner approval rule set does generate the notification but does not send an email notification to the employee.

How does employee (expense owner) approve this expense report if the email notification is not sent to the owner? Does he need to be an active user to approve the expense report?