CloudFlare DDNS Not working for domain-only updates (@ record for domain)
Since the CloudFlare DDNS code was changed to split hostname and domain, it is not possible to properly update the
record for a domain since the GUI does not allow the hostname field to be blank or contain .
Affects 2.3.3 and 2.4, older versions do not have the affected code changes.
To me, I have a fix tested by users on the forum.