Portworx on IBM Cloud service catalog UI - Failed to load list of RHOCP/Kubernetes clusters

The issue is while trying to provision “Portworx Enterprise” service.
IBM Cloud API key is a mandatory field while provisioning the service and when we specify a key it starts loading a new field to select the cluster for the service, but then without any errors stops loading and hides the cluster name field. Without selecting the cluster name, we can’t proceed with creating the service as it fails.
I have raised the same on Portworx support. Just checking here, if some one else has also faced similar kind of issue.