This article explains the default permissions set on the Live Assist Administrator role in Microsoft Dynamics 365. These are required for the service to operate correctly.
If you or another application has made changes to the permissions, you must change the settings back to those shown. (See create or edit a security role to manage access for how to adjust settings.)
Core Records
Service
Business Management
Customization
Custom Entities
Note: This is a long list, so where there are no permissions those portions of list have been omitted. The list is sorted alphabetically, so these gaps should be easy to follow.
For the Channel Integration Framework you also need the Channel Provider Read access.
Note: We have also seen this labelled as Provider