How do I get ddclient 3.10 to only update when the IP address changes?

It always tries to update, almost always get's a "nochg" response from api.dynu.org.

The cache file updates every time and seems to indicate that everything's OK:

## ddclient-3.10.0
## last updated at Sat Jun  3 08:34:49 2023 (1685799289)
atime=0,backupmx=0,custom=0,host=xxxxxxxxxxxxxxxxxx.mywire.org,ip=aa.b..cc.dd,mtime=1685799193,mx=,script=/nic/update,static=0,status=good,status-ipv4=noconnect,status-ipv6=noconnect,warned-min-error-interval=1685799289,warned-min-interval=0,wildcard=0,wtime=30 grantstreet.mywire.org

But the next time it runs it will say that the last update failed, try to do an update, and receive a 'nochg' response again.

Is a 'nochg' response considered a failure?