Wireguard Fails on VPS Contabo ipv6?


I am using YH for about a two weeks now and don’t get WG-Server up running. It seem’s to be an IP6 issue.

My YunoHost server

Hardware: VPS bought online Contabo 16gb / 6vcore / stativ ipv4&6
YunoHost version: (stable).
I have access to my server : Through SSH | through the webadmin | direct access via keyboard / screen
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : yes (I tried setting up the vpn with a own domain)

Description of my issue

I want to have a running wg server with web ui. Thats what I am trying to achieve. The web UI is running without any problems and I can create and delete users. It has only ipv4 according to the Yuno Host server. The Server itself seems to have ipv6 hence I get the ip6 issue in the YH Diagnosis page.
My Network config:

The loopback network interface

auto lo
iface lo inet loopback

The primary network interface

auto eth0
iface eth0 inet static
address 194.*
gateway 194.*
dns-search invalid
up ip route replace 194.0/18 via 194.

.1 dev eth0

iface eth0 inet6 static
address 2a02*****0001
netmask 64
gateway fe80::1
accept_ra 0
autoconf 0
privext 0

I restartet everything many times but it doesn’t seem to recognize. Also when running Hostname -I i only receive an IP4 address back.

This are the WG Logs: hastebin

Anyone an idea or maybe even better solution for this issue?

The Diagnosis to ip6

[WARNING] The server does not have working IPv6.
  - Having a working IPv6 is not mandatory for your server to work, but it is better for the health of the Internet as a whole. IPv6 should usually be automatically configured by the system or your provider if it's available. Otherwise, you might need to configure a few things manually as explained in the documentation here: https://yunohost.org/#/ipv6. If you cannot enable IPv6 or if it seems too technical for you, you can also safely ignore this warning.

Thanks for your help!

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