Issue mapping realm for keycloak behind haproxy ingress via oidc in a kubernetes cluster

Getting advice
,
1

I have following design for my auth.
oauth2_proxy → keycloak → (success auth) → haproxy ingress controller → ingress path

I have used oauth2_proxy to reach to keycloak by setting the provider as oidc with below information

   - args:
    - --cookie-secure=true
    - --provider=oidc
    - --upstream=https://haproxy-service.pegasus.svc.cluster.local
    - --email-domain=*
    - --pass-basic-auth=true
    - --pass-authorization-header=true
    - --ssl-insecure-skip-verify=true
    - --ssl-upstream-insecure-skip-verify=true
    - --insecure-oidc-allow-unverified-email=true
    - --redirect-url=/oauth2/callback
    - --scope=openid profile email
    env:
    - name: OAUTH2_PROXY_OIDC_ISSUER_URL
      value: https://app.172.16.22.169.nip.io:32443/auth/realms/<REALM>
    - name: OAUTH2_PROXY_CLIENT_ID
      value: <CLIENT NAME>
    - name: OAUTH2_PROXY_CLIENT_SECRET
      value: <SECRET>
    - name: OAUTH2_PROXY_COOKIE_SECRET
      value: <SECRET>

and my ingress config looks like below

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: keycloak-ingress
  namespace: pegasus
  annotations:
    ingress.kubernetes.io/rewrite-target: /auth
    kubernetes.io/ingress.class: "haproxy-sso"
spec:
  tls:
  - hosts:
  rules:
  - host:
    http:
      paths:
      - path: /auth
        backend:
          serviceName: keycloak
          servicePort: 8080

Issue which I have currently is when I hit the ingress path using /auth context, it routes me to login page of keycloak of master realm.
is there a way i can achieve redirect to right realm?

Required url: /auth/admin/REALM/console
Current url: /auth/admin/master/console

Any suggestions at oauth2_proxy side or ingress side or keycloak would be helpful for solving this case. Kindly help.