Dynamic DNS service not starting

I've turned on "Dynamic DNS" in System Settings / Services. The configuration appears in /etc/inadyn.conf as expected, but the address doesn't get updates. In /var/log/syslog:

Mar 9 09:58:19 home systemd[1]: inadyn.service: Succeeded.
Mar 9 10:00:19 home inadyn[3523]: inadyn: Not starting. Disabled in /etc/default/inadyn.

Looks like the service is indeed turned off in /etc/default/inadyn:

{{

1. Please note, /etc/inadyn.conf should be properly configured before running inadyn
2. Set to "yes" if inadyn should run in daemon mode
3. If this is changed to "yes", RUN_IPUP must be set to "no".
   RUN_DAEMON="no"

1. Set to "yes" if inadyn should be run every time a new ppp connection is
2. established. This might be useful, if you are using dial-on-demand.
   RUN_IPUP="no"

1. The user and group that inadyn should be run as.
   USER="debian-inadyn"
   GROUP="debian-inadyn"
   }}