Kein IPv6 prefix via PPPoE (Mikrotik)

/ipv6 dhcp-client
add interface=pppoe-telekom pool-name="Pool IPv6 Global Unique Address" request=prefix use-peer-dns=no  

/ppp profile
add change-tcp-mss=yes comment="Telekom VDSL profile" name=VDSL-Telekom only-one=yes  

/interface pppoe-client
add add-default-route=yes allow=pap,chap,mschap2 dial-on-demand=yes disabled=no interface=ether1 \
    max-mru=1492 max-mtu=1492 name=pppoe-telekom user=...0001@t-online.de

/ipv6 firewall address-list
add address=::/128 comment="defconf: unspecified address" list=bad_ipv6  
add address=::1/128 comment="defconf: lo" list=bad_ipv6  
add address=fec0::/10 comment="defconf: site-local" list=bad_ipv6  
add address=::ffff:0.0.0.0/96 comment="defconf: ipv4-mapped" list=bad_ipv6  
add address=::/96 comment="defconf: ipv4 compat" list=bad_ipv6  
add address=100::/64 comment="defconf: discard only " list=bad_ipv6  
add address=2001:db8::/32 comment="defconf: documentation" list=bad_ipv6  
add address=2001:10::/28 comment="defconf: ORCHID" list=bad_ipv6  
add address=3ffe::/16 comment="defconf: 6bone" list=bad_ipv6  

/ipv6 firewall filter
add action=accept chain=input comment="defconf: accept established,related,untracked" connection-state=\  
    established,related,untracked
add action=drop chain=input comment="defconf: drop invalid" connection-state=invalid  
add action=accept chain=input comment="defconf: accept ICMPv6" protocol=icmpv6  
add action=accept chain=input comment="defconf: accept UDP traceroute" port=33434-33534 protocol=udp  
add action=accept chain=input comment="defconf: accept DHCPv6-Client prefix delegation." dst-port=546 \  
    protocol=udp src-address=fe80::/10
add action=accept chain=input comment="defconf: accept IKE" dst-port=500,4500 protocol=udp  
add action=accept chain=input comment="defconf: accept ipsec AH" protocol=ipsec-ah  
add action=accept chain=input comment="defconf: accept ipsec ESP" protocol=ipsec-esp  
add action=accept chain=input comment="defconf: accept all that matches ipsec policy" ipsec-policy=\  
    in,ipsec
add action=drop chain=input comment="defconf: drop everything else not coming from LAN" \  
    in-interface-list=!LANs
add action=accept chain=forward comment="defconf: accept established,related,untracked" \  
    connection-state=established,related,untracked
add action=drop chain=forward comment="defconf: drop invalid" connection-state=invalid  
add action=drop chain=forward comment="defconf: drop packets with bad src ipv6" src-address-list=\  
    bad_ipv6
add action=drop chain=forward comment="defconf: drop packets with bad dst ipv6" dst-address-list=\  
    bad_ipv6
add action=drop chain=forward comment="defconf: rfc4890 drop hop-limit=1" hop-limit=equal:1 protocol=\  
    icmpv6
add action=accept chain=forward comment="defconf: accept ICMPv6" protocol=icmpv6  
add action=accept chain=forward comment="defconf: accept HIP" protocol=139  
add action=accept chain=forward comment="defconf: accept IKE" dst-port=500,4500 protocol=udp  
add action=accept chain=forward comment="defconf: accept ipsec AH" protocol=ipsec-ah  
add action=accept chain=forward comment="defconf: accept ipsec ESP" protocol=ipsec-esp  
add action=accept chain=forward comment="defconf: accept all that matches ipsec policy" ipsec-policy=\  
    in,ipsec
add action=accept chain=forward comment="allow CORE clients to access all other VLANs" in-interface=\  
    "VLAN 20 - Core" out-interface-list=LANs  
add action=accept chain=forward comment="allow internet access for allowed VLANs" dst-port=80,443 \  
    in-interface-list="INTERNET ACCESS" out-interface-list=WAN protocol=tcp  
add action=drop chain=forward comment="defconf: drop everything else not coming from LAN"  
/ipv6 firewall mangle
add action=log chain=output disabled=yes dst-port=547 dst-prefix=::/0 log-prefix="ipv6 client" \  
    protocol=udp src-prefix=::/0

/ipv6 nd
set [ find default=yes ] interface=vlan-bridge