Register this URL from ONAP Portal: Steps to register UUI on ONAP Portal
Step 1. Login as demo user on ONAP Portal
Step 2. From menu on the left pane, choose Application Onboarding, and fill in UUI url http://{{openo_vm_ip}}/iui/usecase-ui/#/common
Step 3. From menu, choose Application Catalog and check UUI app
Step 4. Go to Home from menu, and you should see UUI app