Dashboard behind Keycloak Gatekeeper

Hallo everybody!
I try to put dashboard behind keycloak gatekeeper to get advanced auth options.
docker-compose.yaml:

version: '3.7'

services:
  traefik:
    image: traefik:v2.2
    ports:
      - "80:80"
      - "443:443"
      - "8080:8080"
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - ./traefik.yaml:/traefik.yaml
      - ./acme.json:/acme.json
    env_file: 
      - acme.env
    networks: 
      - proxy
  gatekeeper:
    image: quay.io/keycloak/keycloak-gatekeeper:9.0.2
    command:
      - --listen=0.0.0.0:3000
      - --discovery-url=https://auth.dev.whizus.net/auth/realms/whizus
      - --client-id=traefik
      - --client-secret=<some-secret>
      - --redirection-url=https://dashboard.dev.whizus.net/
      - --enable-refresh-tokens=true
      - --upstream-url=http://traefik:8080/
      - --encryption-key=<some-key>
    networks:
      - proxy
    labels:
      - traefik.enable=true
      - traefik.http.routers.gk.rule=Host(`dashboard.dev.whizus.net`)
      - traefik.http.routers.gk.tls.certresolver=letsencrypt
      - traefik.http.routers.gk.tls.domains[0].main=dev.whizus.net
      - traefik.http.routers.gk.tls.domains[0].sans=*.dev.whizus.net
      - traefik.http.routers.gk.entrypoints=websecure
      - traefik.http.services.gk.loadbalancer.server.port=3000
      - traefik.http.routers.gk.tls=true

networks:
  proxy:
    external:
      name: proxy

relevant traefik.yaml parts:

api:
  dashboard: true
  insecure: true

providers:
  docker:
    exposedByDefault: false
    network: proxy

entryPoints:
  web:
    address: ":80"
    http:
      redirections:
        entrypoint:
          to: websecure
  websecure:
    address: ":443"
  
certificatesResolvers:
  letsencrypt:
    acme:
      ...

Curious thing now is that if I go to http://dashboard.dev.whizus.net I will be redirected, which is expected, then after successful login I'm redirected back but to http://traefik:8080/dashboard/.

When I manually type http://dashboard.dev.whizus.net/dashboard/ everything works as expected. I thing I need to put some middleware for path redirection (tried with build-in, no success).

Does anyone has an idea whats missing/wrong?

Hi can you show me the client part in keycloak GUI ?