RT-AC86U and IPv6

[nospamever]

RT-AC86U Firmware 386.14_2
My test setup is laptop > RT-AC86U > modem/router (DHCP and ipv6 enabled) > WAN
My ISP is using PPoE so I set the RT-AC86U as PPoE and ipv6 as Native. Tested with google ipv6 test and result returned negative so only ipv4 is active.
I connect my laptop directly to the modem/router, did the ipv6 test and returned positive. So pretty sure the RT-AC86U is not configured properly.
Hoping someone can help where I did wrong. Cheers.

 

[nospamever]

It works now. I simply mess around the ipv6 settings on RT-AC86U.
I disabled Accept Default Route and apply. No joy.
Then I disabled Accept Default Route and apply. Full joy. The trick is WAN prefix length is not 64 but 56.