How to Delete Old Tasks/Streams Assigned by Deactivated Users? 'Operation Not Permitted' Error

How to Delete Old Tasks/Streams Assigned by Deactivated Users? 'Operation Not Permitted' Error

Hello,

I’m using Zoho Mail and have several old tasks assigned to me in Tasks and Streams. These tasks were created by former employees whose accounts are now deactivated. When I try to delete these tasks, I get an "Operation Not Permitted" error.

These unused tasks have been accumulating for nearly 5 years, and I’d like to clean them up. How can I permanently remove these old entries? Is there an admin-level solution (e.g., database cleanup or tool) to handle tasks from deactivated users?

Thanks in advance for your help!