LoadBalancer endpoint timing out with 400

I have deployed a load balancer endpoint. I can see workers are running fine and application startup logs as well. But when I hit the endpoint request times out with 400 BadRequest

I have set PORT, PORT_HEALTH env variables to the same port as my FastAPI application running port. exposed same in the container as well. I can see requested are received by Loadbalancer but shows them as failed. But do not see them reaching workers as no respective logs. Any guidance on debugging would be helpful!
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