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Ubunut 21.10 IPv6 only KVM/qemu VM With CloudInit: no ping / ssh possible

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I am running Proxmox and i have a Ubuntu 21.10 VM with only a public IPv6 address that is setup with CloudInit (using ubuntu-21.10-server-cloudimg-amd64-disk-kvm.qcow2).

So no IPv4 address.

When i try to ping or SSH from my home pc (IPv6 works) i am not getting a respond and cannot login. When i create a VM with AlmaLinux IPv6 only this works.

The IPv6 address is pushed with CloudInit and i can see that in proxmox (wia qemu-guest-agent).

So i think it might has to do something with the internal firewall of Ubuntu as it works with Almalinux and other

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