Home assistant Google assistant error 404

Hi there

Error 404 on sync with Google Assistant.

Have used //google assistant tutorial and also several Youtube howto, but what ever I do, I end up with error 404.
´Request for https://homegraph.googleapis.com/v1/devices:requestSync failed: 404´

´´´Traceback (most recent call last):
File “/usr/src/homeassistant/homeassistant/components/websocket_api/commands.py”, line 199, in handle_call_service
await hass.services.async_call(
File “/usr/src/homeassistant/homeassistant/core.py”, line 1849, in async_call
task.result()
File “/usr/src/homeassistant/homeassistant/core.py”, line 1889, in _execute_service
await cast(Callable[[ServiceCall], Awaitable[None]], handler.job.target)(
File “/usr/src/homeassistant/homeassistant/helpers/entity_component.py”, line 226, in handle_service
await service.entity_service_call(
File “/usr/src/homeassistant/homeassistant/helpers/service.py”, line 798, in entity_service_call
future.result() # pop exception if have
File “/usr/src/homeassistant/homeassistant/helpers/entity.py”, line 980, in async_request_call
await coro
File “/usr/src/homeassistant/homeassistant/helpers/service.py”, line 838, in _handle_entity_call
await result
File “/usr/src/homeassistant/homeassistant/components/button/init.py”, line 116, in _async_press_action
await self.async_press()
File “/usr/src/homeassistant/homeassistant/components/google_assistant/button.py”, line 52, in async_press
raise HomeAssistantError(
homeassistant.exceptions.HomeAssistantError: Unable to sync devices with result code: 404, check log for more info´´´

In Google Home app, I am unable to integrate with HA, error “could not reach” try again

I am down to the idea, that it could be router problem, but not sure since I am unable to sync from HA to Google Assitant and not only the other way.

Running on RPi4
Router Unifi UDM SE

Configuration.yaml:
´´´http:
ssl_certificate: /ssl/fullchain.pem
ssl_key: /ssl/privkey.pem
########################################

Google Home Integration

########################################
google_assistant:
project_id: hassio-xxxxxxxxxx-11157
service_account: !include SERVICE_ACCOUNT.json
report_state: true
expose_by_default: true
exposed_domains:
- switch
- lights
entity_config:
switch.alrum_lys:
name: Alrum

SERVICE_ACCOUNT.json is the downloaded json file from when generated key (under 4.5 of the tutorial)

https: work on ip in the fullfillment url

Any ideas out there
Marinus