OVH how can I add IPv6 through vRACK vmbr1

network:
    version: 2
    ethernets:
        eth0:
            addresses:
            - 51.195.1xx.89/28
            - 2001:41d0:802:8xxx::3/128
            gateway4: 51.195.1xx.94
            gateway6: fe80::1
            match:
                macaddress: ce:bf:ed:79:2c:99
            nameservers:
                addresses:
                - 213.186.33.99
                search: []...