IPv6 over PPPoE

My ISP is assigning me a Prefix over DHCPv6.
The Wan IP (Framed IPv6 Prefix) I’m getting over NDP RA.
The Problem is that a router is not sending RS. I can only acquire Delegated IPv6 Prefix via DHCPv6 Client.
So the question is.:
Is there a way to get Framed IPv6 Prefix over PPPoe Client