Hey Guys,
i ran into the same problem. After some research i got it to work. Since ddns switched to the new api you have to activate Dynamic DNS Update in the so called Update interface v2 (FreeDNS - Free subdomain AND domain hosting!) and check the tokens matching those you typed in the ddns settings in the webinterface. After a ddns -d update-all --force the update went through successfully.
I hope this helps you.
Greetings
Steffen
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