Cannot make it work -- Tailscale + Headscale + Vaultwarden on local domain

What type of hardware are you using: Raspberry Pi 3, 4+
What YunoHost version are you running: 12.0.14
How are you able to access your server: The webadmin
SSH
Are you in a special context or did you perform specific tweaking on your YunoHost instance ?: no

Describe your issue

Hi everyone, I’m trying to configure this:

  • Headscale ynh app running on public domain
  • Tailscale on ynh + a few hosts
  • Vaultwarden ynh app running on a local domain

The idea is to install vaultwarden but not to expos it to a public domain, but to connect to it using tailscale+headscale.
All the apps are installed and working, the hosts are connected using my own headscale instance, but I’m not being able to connect my bitwarden app on any of my devices to the vaultwarden server, obtaining a “fetch error”

Share relevant logs or error messages

no logs are enerated on yunohost regarding this issue

Do you have errors and warnings about it in your browser console or in Vaultwarden’s service logs?