External URL with Nginx proxy not working

I’ve setup external URL, for my instance of HA, using the Nginx proxy addon.
Everything worked fine, I even managed to get the integration with google assistant going. But after few days it just stopped and I can’t for the love of me figure out why.

I get couldn’t connect message with HA logo when I try to access my domain url.

This is my http config:

http:
 use_x_forwarded_for: true
 trusted_proxies:
  - 172.30.33.2

Proxy host config:

{
  "id": 3,
  "created_on": "2021-10-01T06:47:48.000Z",
  "modified_on": "2021-10-06T10:53:01.000Z",
  "owner_user_id": 1,
  "domain_names": [
    "mydomain.duckdns.org"
  ],
  "forward_host": "192.168.50.155",
  "forward_port": 8123,
  "access_list_id": 0,
  "certificate_id": 23,
  "ssl_forced": true,
  "caching_enabled": false,
  "block_exploits": false,
  "advanced_config": "",
  "meta": {
    "letsencrypt_email": "[email protected]",
    "letsencrypt_agree": true,
    "dns_challenge": false
  },
  "allow_websocket_upgrade": true,
  "http2_support": false,
  "forward_scheme": "http",
  "enabled": 1,
  "locations": [],
  "hsts_enabled": false,
  "hsts_subdomains": false
}

Browser console error when trying to access my domain:
Annotation 2021-10-06 161814

I also noticed this error in the log when HA is starting:

Logger: homeassistant.components.websocket_api.http.connection
Source: components/websocket_api/connection.py:89
Integration: Home Assistant WebSocket API (documentation, issues)
First occurred: 9:38:34 AM (1 occurrences)
Last logged: 9:38:34 AM

[2957918272] Received invalid command: mobile_app/push_notification_channel

I guess HA can’t get the SSL key from the proxy? Can anybody tell me what I’m missing?