Hello,
I've found my issue, so I'm sharing the issue resolution and some tips for beyond.
1- You must follow the installation guide (strictly, yes!, seriously, strict).
2- You must ensure the vpn settings are correct on server side (I've waste a lot of time, when the solution was into the .ovpn file)
3- You have to dig supervisor.log to find issue.
4- I didn't figure out how to make sso working between rtorrent/rutorrent - organizr (dunno if in fact its possible)
5- Bonus : if you are facing torrent client issue to connect to private tracker, double check your vpn settings, the issue is there (certainly ssl connection breaks; check vpn provider docs; adjust mtu)
Thank you binhex for the amazing work.