Resolution:
When creating a Service Discriminator using the serviceName property, it may appear that the discriminator is not matching the Service Name in the Service Registry page.

This happens because the Service Discriminator actually looks for the serviceName property in the Description section of the Edit Service section of the Service Registry page. It does not use the Service Name that is listed in the Service Registry page itself. This name is simply a placeholder, not a property that can be used in discrimination.