Hello there!
I’m trying to use the XMPP feature of Yunohost.
I’ve enabled related ports on my box and check it works via http://ports.yunohost.org/
However, using Pidgin and documentation here https://yunohost.org/#/XMPP, it seems I can connect, because I can add contacts. But contacts appear as “Not authorized” (non autorisé in french) with an error “Remote server not found” (Serveur distant non trouvé).
Can someone tell me if I missed something?
Self-response, got it 
Missed the dns configuration from https://yunohost.org/#/dns_config.
Besides, a cannot add the requested entry to my dns with the OVH administration page. Seems like a bug. I refuses a priority with a value 0. Just changed it to 1 and there it went.
Everything else works fine, I’ve been able to communicate through Pidgin and its plugin OTR.
Now I’m looking for a web client to install in Yunohost to ease the use of my XMPP server, if anyone knows any