Auto Refresh DDNS on WAN Fail-over

[skull1-2004]

Hi,
I am using 22.05. I have dual wan setup and i want the DDNS to capture the new IP in a fail-over situation. Right now i need to force the update to refresh the cached IP. I am using google domains for DDNS.

I have found the code below to create a cron job to force refresh every 30 min.

I want my version to check every 10 min so I changed the line to this:

CRON: */10 * * * * root /usr/bin/nice -n20 /etc/rc.force.dyndns.update

It's not working though. I assume i need to change this line:
myIP=dig +short myip.opendns.com @resolver1.opendns.com

Can anyone give me some advice on this? Thanks!

edit:
saw this bug but cannot be replicated by "Jim"
https://redmine.pfsense.org/issues/12485

https://serverfault.com/questions/1092678/how-to-automatically-save-and-force-update-of-a-dynamic-dns-on-pfsense

CRON: */30 * * * * root /usr/bin/nice -n20 /etc/rc.force.dyndns.update

#!/bin/sh
dynamicHost=""
myIP=`dig +short myip.opendns.com @resolver1.opendns.com`
myIP_error=$?
noIP=`dig $dynamicHost | grep -A1 ANSWER | grep IN | cut -f 6`

if [ "$myIP" == "$noIP" ] ; then
    exit
else

    if [ "$myIP_error" -eq 0 ]
        then
            /etc/rc.dyndns.update
        else
            exit
    fi
fi