There are a few requirements for views used in Round Robin queues. Please check your view's conditions and permissions:
Who has access
Must be either Any agent or Agents in specific groups.
If using "Agents in specific groups," please make sure that you select groups that include all admins and users with the "Manage App?" permission.
Conditions (Meet all)
- Ticket: Assignee > Is > -
- Ticket: Status > Less than > Pending (or any other combination that filters for unsolved tickets)
Note: Tickets are routed in the context of the admin who installed the app. Avoid using conditions such as Ticket: Group > Is > (current user's groups). Instead, create a separate view and queue for each group.
Here is a sample view: