• You need to set KONG_ADMIN_GUI_URL correctly.

  KONG_ADMIN_GUI_URL=http://YourServerURL:Port
  such as:- KONG_ADMIN_GUI_URL=http://66.107.66.145:8002

• Following this issue here for more details.

Your problem is that you've got KONG_ADMIN_GUI_URL incorrectly set, causing Kong Manager's Admin API requests to be rejected due to CORS protection.