Salesforce Queue Sharing Rule Does Not Grant Access to Queue List View

A Sharing Rule grants access to records but does not automatically add users to the Queue. Users outside the Queue will see an 'Insufficient Privileges' error even if a Sharing Rule has been applied.

The default List View that is created in conjunction with a Queue is filtered by Queue (a radio button in the List View settings). When any List View is filtered by Queue, it is restricting visibility to Queue Members.  

The Sharing Rule grants access to the records, however, it does not make them a member of the Queue.  

List View Workaround

If adding the affected users as Queue Members is not ideal, you can change the List View settings:

1. Click Edit on the List View.
2. Modify the filter from "Queue" to the "All Cases".
3. Under "Additional filter criteria," select Case Owner Alias equals Queue Label (or for Leads, set the criteria as Owner Alias equals Queue Label).

This returns the same contents of the Queue List View, but can be accessed by Users outside of the Queue.  

Note: Possible inconsistency may be found between Classic and Lightning, where the queue list view in Lightning cases that are owned by the queue and accessible by that non-queue user is displayed.