Thanks for the information.
For me i had to use the ‘pwd__YOUR_DOMAIN' instead of the “shared secret”.
Using the “shared secret” i can’t create a conv.
Using the “pwd__YOUR_DOMAIN"i can create conversation.
See this ticket: Bug report: Generated HPB passwords are not visible in the YunoHost interface · Issue #14 · YunoHost-Apps/nextcloud-signaling_ynh · GitHub
Edit 1: Also, i needed to open the 5349 port both in TCP & UDP (i found this by running YNH Diag, because the coturn postinstall doesn’t say anything about opening a special port)
Edit 2: with open port, it works but only in local network (which is quite useless). I try to redirect UDP 443 to 5349 as explained here: Enh udp 443 by zamentur · Pull Request #31 · YunoHost-Apps/coturn_ynh · GitHub but i failed to do this redirection.
Maybe i missed something: Do i need to install the CoTurn server on a different machine? (right now, i have 3 soft on the same machine: YNH with NC+NC Signaling+CoTurn)