I tried to use the recommended new os-ddclient plugin with my WAN-Failover-Gateway-Group setting. But there is no choice to select WAN-Failover-Interface on the setting "Interface to monitor" during configuration. You can choose "Interface to monitor" = none , but this has no effect. The host will not be updated.
In contrast to it, the legacy os-dyndns plugin had supported this option.
Has somebody similar problems? Is there a solution (planed)?
Can confirm this is an issue I can replicate... There is this thread https://forum.opnsense.org/index.php?topic=26446 (https://forum.opnsense.org/index.php?topic=26446) where issues are being posted.