You are absolutely correct i was wrong and figured it out
once you run your docker you have to edit the file /config/ddclient.conf
find the hosting provider you are using and uncomment it
i also had to add
use=web at the top
use=web
protocol=cloudflare,
zone=domain.tld,
ttl=1,
login=EMAIL,
password=GLOBALAPIKEY
domain.tld,my.domain.tld