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 https://xxxxx.synology.me:443, 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.

Thank

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

# Text to speech
tts:
  - platform: google_translate

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

google_assistant:
  project_id: smarthome
  report_state: true
  service_account: !include google_assistant.json
  expose_by_default: true
  exposed_domains:
    - switch
    - light
    - cover
  entity_config:
    switch.wall_switch_left_158d000346341d:
      name: roomlight
      aliases:
        - roomlight
        - masterroomlight