ubuntu – How to assign ipv6 address to the secondary vnic in oracle cloud

Running OS Ubuntu 18.4

How can i assign ipv6 address to the secondary vnic, to the primary vnic i can assign to the primary vnic and curl trough but in the secondary it not work. I assign secondary vnic over the GUI and configure it with the script on this site

https://docs.oracle.com/en-us/iaas/Content/Network/Tasks/managingVNICs.htm#Linux

I can curl trough the ipv4 address but ipv6 not work, i think the script not configure the ipv6 for the secondary vnic.