Repeated DynDNS error

My YunoHost server

Hardware: VPS bought online
YunoHost version:
I have access to my server : Through SSH + through the webadmin
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no

Description of my issue

Hello, I don’t understand why, but I am now getting emails every 10 minutes with object:

Cron <root@server> : YunoHost DynDNS update; sleep $((RANDOM%60)); ! ping -q -W5 -c1 >/dev/null 2>&1 || test -e /var/run/moulinette_yunohost.lock || yunohost dyndns update >> /dev/null

…and body:

The peer didn't know the key we used
Could not update IP address to DynDNS

Where does this come from?

have you been able to solve the issue?