What action is required to allow a queue to be used with unified routing after it has been created?

To allow a queue to be utilized with unified routing after it has been created, enabling the queue for Automatic Work Distribution is essential. This step integrates the queue within the automated processes of Dynamics 365, ensuring that work items can be distributed efficiently among available resources.

Automatic Work Distribution plays a crucial role in how queues manage incoming work. When this feature is enabled, it allows the unified routing system to consider the queue during its decision-making processes, which involves assigning incoming cases or other workload items based on availability and capacity of support staff. Without this enabling action, the queue would not function optimally within the context of unified routing, potentially resulting in unassigned workloads that can lead to delays in service.

The other options, while important for different aspects of queue management, do not directly pertain to enabling unified routing. For example, setting up an incoming email address for the queue is essential for email-based interactions but does not affect the routing capability. Similarly, configuring the queue as a private queue or relying on it to work automatically would not provide the necessary integration with unified routing processes. Hence, enabling Automatic Work Distribution is the key action required for effective use of the queue in this feature's context.