Accessing keycloak using lbs on aws and zuul as gateway

I’m using zuul as a gateway to my microservices. When my front-end hits zuul dns url and he dont have token he is being redirected to login page and all work well, but if i change my front-end to call zuul using lbs dns, he is getting 404 on the following url dns-url/sso/login.
Can anyone tell me what i’m doing wrong?