Keycloak with NGINX proxy server not authenticatin

Question

I have a sample app which correctly secures the rest api locally without nginx. Now when I put this in production behind a nginx proxy it does not work. No errors. It allows all request.

Front end serer with ssl is https://frontend.com

Back end server with ssl is https://backend.com

Keycloak proxy forward is true

Front end server(node server on 9000) <-> NGINX <-> Keycloak (running on 8180)

nginx file sample

upstream keycloak_server {
  server localhost:8180;
}

upstream node_server {
  server localhost:9000;
}

location /auth/ {
  proxy_pass http://keycloak_server;
  proxy_http_version 1.1;
  proxy_set_header Host              $host;
  proxy_set_header X-Real-IP         $remote_addr;
  proxy_set_header X-Forwarded-For   $proxy_add_x_forwarded_for;
  proxy_set_header X-Forwarded-Proto $scheme;
}  
location / {
  proxy_pass http://node_server;
  proxy_http_version 1.1;
  proxy_set_header Host              $host;
  proxy_set_header X-Real-IP         $remote_addr;
  proxy_set_header X-Forwarded-For   $proxy_add_x_forwarded_for;
  proxy_set_header X-Forwarded-Proto $scheme;
}

Front end server calls a backend api using Angular. REST api calls looks like https://backend.com/callTest

Backend server(running on tomcat) <-> NGINX <-> Spring Boot(with keycloak)

nginx sample

location / {
  proxy_pass http://127.0.0.1:8080/dt-1.0/;
  proxy_http_version 1.1;
  proxy_set_header Host               $host;
  proxy_set_header X-Real-IP          $remote_addr;
  proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for;
  proxy_set_header X-Forwarded-Proto  $scheme;
}  

in angular keycloak.json looks like

{
  "realm": "demo",
  "auth-server-url": "https://frontend.com/auth",
  "ssl-required": "none",
  "resource": "tutorial-frontend",
  "public-client": true
}

in spring boot keycloak properties look like

  keycloak.auth-server-url=https://frontend.com/auth
  keycloak.realm=demo
  keycloak.resource=tutorial-frontend
  keycloak.public-client=true
  keycloak.bearer-only = true
  keycloak.cors = true
  keycloak.security-constraints[0].authRoles[0]=user
  keycloak.security-constraints[0].securityCollections[0].patterns[0]=/*

Please let me know how to correct this. I would really appreciate it.