Problem with Dyndns after outage


I still have an issue after the outage with Dyndns:

Communication with 2a03:7220:8080:5c00::1#53 failed: operation canceled
update failed: FORMERR
Info: The operation ‘Update the ip associated with your YunoHost subdomain ‘’’ has failed!

Communication to 2a03:7220:8080:5c00::1/ is possible from my Yunohost:
ping6 2a03:7220:8080:5c00::1
PING 2a03:7220:8080:5c00::1(2a03:7220:8080:5c00::1) 56 data bytes
64 bytes from 2a03:7220:8080:5c00::1: icmp_seq=1 ttl=52 time=46.9 ms
64 bytes from 2a03:7220:8080:5c00::1: icmp_seq=2 ttl=52 time=32.4 ms
64 bytes from 2a03:7220:8080:5c00::1: icmp_seq=3 ttl=52 time=30.7 ms

curl is showing “Wanna play the dynette ?”
A yunohost dyndns update results in: “Error: Unable to update IP address on DynDNS”

I don´t know what the “FORMERR” means.
What could be my problem?

Hmm…still after a unsubscribe/re-subscribe the error is still there.
I´ve uploaded the log:

Please help.

Looks like I have found a workaround here [Résolu] Probléme avec dyndns by using sudo sysctl -w net.ipv6.conf.all.disable_ipv6=1
Now: “Info: No updated needed.”
But why?
I actually want to keep ipv6 enabled for Pihole.

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