I think I've finally found a way to get it work! On your deco under Advanced settings> IPv6 > Change the ipv6 connection type to Bridge mode and voila! passed Ipv6 test!

I enabled IPv6 on both the BGW210 and the Deco (sreenshots below) but keep getting failed IPv6 tests 0/10 and the results showed "No IPv6 address detected" ( I used this website: test-ipv6.com). So i...