When the operator is used, there is an extra environment variable, recently added, that needs to be set,
to allow the controlled sites to expose resources from other namespaces (not yet in the documentation).

In the Subscription resource, under the 'spec' attribute, you must add:

  config:
    env:
    - name: CLUSTER_PERMISSIONS_ALLOWED
      value: "true"

Then in the 'skupper-site' ConfigMap, make sure you also have:

  cluster-permissions: "true"

Basically, both definitions must be present for the Operator to allow resources from other
namespaces to be exposed by a given site.

One important note is that the subscription must have the environment variable above before
the Service Interconnect site is created.