If you disabled service-sync and expose a service on one site, the service is reported as existing on all other sites even tho the service doesn't exist.
To workaround this issue use skupper service status -v to understand where the services are available 
 
 
{{Services exposed through Skupper:
╰─ backend:8080 (tcp)
   ╰─ Sites:
      ╰─ 316fbe31-299b-490b-9391-7b46507d76f1(east)}}
         │ policy: disabled
         ╰─ Targets:
            ╰─ backend:8080 name=backend-9d84544df-rbzjx
 

https://github.com/skupperproject/skupper/issues/1466