Problem Definition

When a Request is created in Service Desk, Organization Members only receive a notification that the request is created and must opt in to receive additional updates by accessing the Customer Portal and clicking on Get notifications and this not configurable depending on the organization.

reference: Managing Service Desk Notifications

Suggested Solution

As different customer organization can have different requirements, create a configuration to choose which organization will receive notifications and which one won't receive.

Workaround

Organization Member must opt-in to receive additional notifications clicking on Get notifications on the request