Setting up IPv6 on a RT-AC68U

Hello,

I've tried a few times but never managed to get IPv6 working on my RT-AC68U with Merlin wrt.
I am running on latest from July, I think have correct settings but I only get a link-local IP for my computer...
When I plug my computer directly in the ISP's outlet I do get a global IPv6 so I'm guessing the computer's configuration is fine.

My ISP is CondoInternet/WaveG.

Here are the (default) settings:
Basic Config
Connection type Native
DHCP-PD Enable

IPv6 LAN Setting
LAN...

Setting up IPv6 on a RT-AC68U