Using pidgin I have the following settings:
Protocol: XMPP
Username: folatt
Domain: support@conference.yunohost.org
Resource:
Password:
Local alias:
Connection security: Use encryption if available
Connect port: 5222
Connect server: support@conference.yunohost.org
File transfer proxies: support@conference.yunohost.org
Proxy: no proxy
And the following result:
folatt@support@conference.yunohost.org/ disabled
Invalid XMPP ID