NGINX Reverse Proxy Manager + Google Assistant redirect invalid URI

Configuration
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1

Hi,

I am trying to configure the Google Assistant integration. Google Assistant - Home Assistant
But every time I attempt to do so, I get to the loginscreen in the Google Home app, enter login credentials, it starts trying to connect, but then I get an error saying “Could not reach ha.domain.com”

It is basically the same as this post: NGINX Proxy manager with google assistant except, I my log files shows my gateway router (192.168.1.1) as being the source IP.

I got this in my configuration.yaml file:

http:
  use_x_forwarded_for: true
  trusted_proxies:
    - 192.168.1.0/24

And FYI, the HA is accessible remotely through the external URL, which is the same I am using in the google config.
The Google application has been made with English language.
Nginx Reverse Proxy Manager has enabled WebSocket support.