Edgerouter X PPPoE and native IPv6

Hi Guys,

My ISP (XS4ALL in the Netherlands) is offering native IPv6 on my fiber connection.

The router should receive the v6 address through the PPPoE connection, but it looks like only the v4 address is received. In the config I can't find any specific way to turn it on, does anyone know where I have to look?

Thanks!