J’ai trouvé cette discussion: Raspberrypi - postinstall - unable to change main domain pour résoudre l’erreur “unable to change domain name”.
Donc je tente:
root@yunohost:~> yunohost dyndns subscribe matutine.nohost.me
usage: yunohost [-h] [-v]
{domain,monitor,service,firewall,tools,app,hook,dyndns,backup,user}
...
yunohost: error: unrecognized arguments: matutine.nohost.me