Meet CORS error when using openid-connect to login Kong Manager

My Kong Admin API is running at http://kong:8001 and Kong Manager is running at http://kong:8002

I am using openid-connect to login Kong Manager, but I am not able to login and see below error from browser

Access to XMLHttpRequest at 'http://kong:8002/#id_token=xxx' (redirected from 'http://kong:8001/auth?state=yyy&session_state=zzz&code=qqq') from origin 'http://kong:8002' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

This issue will happen when you have set login_action: redirect in KONG_ADMIN_GUI_AUTH_CONF (or admin_gui_auth_conf). After a successful login at the IDP, Kong Manager tries to redirect to itself via the Admin API.

To solve this error, please delete login_action: redirect from KONG_ADMIN_GUI_AUTH_CONF (or admin_gui_auth_conf).