AWS LIGHTSAIL CONTAINER SERVICE SERVICE_CON NOT WORKING

Hi! I have a web app serving publicly in a port and access an API both in the same Container Service. I am trying to use SERVICE_CON service://localhost as suggested by documentation but it is not working. Any clue? I can see both logs for containers look good, both on steady state serving on both ports.

I use that as the VITE_BASE_URL in the client app to access the API endpoints but the browser complains saying:

service://localhost:3001/api/myassessment ----> URL scheme "service" is not supported.

If anyone has any idea how to fix this, I would appreciate your comments. I also tried using nginx to proxy pass the access to API but using the private domain for my container service does not work as expected.