dyndns will block your account if you update more than 1-2 times on accident … it becomes a big problem with no feedback mechanism. They also use non-standard response codes that are not easily parsed. if you wish use dyndns ddns then point a cname to the changeip hostname.
So for now you can grab a FREE changeip hostname, and point your FREE dyndns hostname to it using a cname… we would even give you a custom dns domain free if you ask nice. We try to treat the Mikrotik community / users well.