Home Assistant installed and running as service in Yunohost, but cannot access it

Hello to all, first time here, and I’m glad to join you. Please bear with me, if this is not the right place to post, but I have nowere to search to fix my problem. Let me explain in brief.
I have a new installation of Yunohost server 11.0.11 (stable), an an RPI 4 model - 2GB. I have installed the HomeAssistant app, in a subdomain, e.g. ha.mydomain.nohost.me. Installation is done from RPI4 terminal, as it is running headless.

The problem, I’m facing is that when I’m trying to connect to Home Assistant domain, I get a 400: Bad Request, and the following errors in homeassistant log:

ERROR (MainThread) [homeassistant.components.http.forwarded] A request from a reverse proxy was received from ::1, but your HTTP integration is not set-up for reverse proxies

ERROR (MainThread) [aiohttp.server] Error handling request Traceback (most recent call last):
File "/var/www/homeassistant/lib/python3.10/site-packages/aiohttp/web_protocol.py", line 334, in data_received messages, upgraded, tail = self._request_parser.feed_data(data)```
File "aiohttp/_http_parser.pyx", line 551, in aiohttp._http_parser.HttpParser.feed_data
aiohttp.http_exceptions.BadStatusLine: 400, message="Bad status line 'Invalid method encountered'"

Home Assistant service is running and listens to 8123, but I cannot log in, as I do not get a login screen, nor can I access instance from localhost.

Before this installation on RPI4 in Yunohost, I have tried using Home Assistant in a VM machine, and everything went well.

I think, I have to make some more configurations, but I have no clue where to start.
Any helpful soul, to assist me on this problem will be very much appreciated.

I am having the same issue - maybe it is a firewall rule?