Google Assistance with Synology's domain

Hi All,

I here to asking help on configuration to set up google assistant.

My system:
Raspberry pi with HassOS 4.11 (newly install)
added Xiaomi Gateway (Aqara) with 4 switches
using Synology’s DDNS and reverse proxy to Raspberry Pi

I able to use mobile data and access Home Assistant via, there is no problem remote all the switch. and now I’m trying setting up google assistant.

I followed the guidance Google Assistant to set up google assistant.

it able to locate the test app in my Google Home App and the log in page pop up.
after I key the username and password and it was singing in.
after few second, signing in window missing and there is nothing added into Google Home App.


# Configure a default setup of Home Assistant (frontend, api, etc)

# Text to speech
  - platform: google_translate

group: !include groups.yaml
automation: !include automations.yaml
script: !include scripts.yaml
scene: !include scenes.yaml

  project_id: smarthome
  report_state: true
  service_account: !include google_assistant.json
  expose_by_default: true
    - switch
    - light
    - cover
      name: roomlight
        - roomlight
        - masterroomlight