Last updated: 2021-06-25

Source: https://support.freshdesk.com/support/solutions/articles/225382-is-it-possible-to-restrict-an-agent-s-access-to-tickets-from-one-portal-only-

The scope of an agent can be based on the groups in the portal. Please navigate to Admin -> Team -> Agents -> click on edit to associate groups within the profile.

This group could be routed to a product under Admin­­ -> Support Operations -> Multiple Products­­ -> Edit the product­­ -> Assign to Group and agents who specifically need to access this product could be added to that Group under Admin -­­> Team -> Groups. They are the ones with group access on the portal. This would restrict them to a particular product portal.