403 Error with KeyCloak

ShinyProxy
#1 
shiny:
 proxy:
  port: 8080
  authentication: keycloak
  admin-groups: admins
  keycloak:
    realm: shinyproxy
    auth-server-url: http://122.22.222.**:8180/auth
    resource: shinyapps
    credentials-secret: 2222222222222222222222222***
 docker:
  internal-networking: true

Create a new realm in Keycloak Console. Input http://122.22.222.**:8080 as the Root URL. And turn on Authorization Enabled.

That’s all I did. When I open Shinyporxy landing page, it redirect to http://122.22.222.**:8080/sso/login and shows the below error

Error

Status code: 403

Message:

Stack Trace:

EDIT: Just open a new issue in github with more details.