IPv6 does not seem to be working on PPPoE interfaces in the 1.4 nightly builds

Try these commands

set interfaces pppoe pppoe0 authentication password xxxxxx
set interfaces pppoe pppoe0 authentication username xxxxxx
set interfaces pppoe pppoe0 dhcpv6-options pd 0 interface eth1 address ‘1’
set interfaces pppoe pppoe0 dhcpv6-options pd 0 interface eth1 sla-id ‘0’
set interfaces pppoe pppoe0 ip adjust-mss ‘clamp-mss-to-pmtu’
set interfaces pppoe pppoe0 ipv6 address autoconf
set interfaces pppoe pppoe0 ipv6 adjust-mss ‘clamp-mss-to-pmtu’
set interfaces pppoe pppoe0 source-interface ‘eth0’
set nat source rule 100 outbound-interface ‘pppoe0’
set service router-advert interface eth1 name-server ‘xxxx:xxxx::1111’
set service router-advert interface eth1 prefix ::/64 valid-lifetime ‘172800’

Eth0 is wan,Eth1 is lan in this case