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Not sure if you got this to work but I was running into something similar. Upon checking logs it would error out because it couldn't find the dns record on cloudflare. I created the record there first, host.yourdomain.com random IP address. I then went back to DDNS setup, selected "IPv4 interface" as method and WAN as interface. Pulled the correct IP and updated it on cloudflare within a few minutes (TTL interval).
Not sure if we have the same exact issues, but this worked for me. Hope it helps.
Not sure if we have the same exact issues, but this worked for me. Hope it helps.
