SFI-Oxygen:IPv6 address to Neutron VM after booting up with IPv6 config mode as SLAAC is not working

RELEASE=CEE CXC1737883_4-1918
VERSION=R8A13
ODL:19.1.1.0-90
CSS: ovs_version: "2.8.2.css5.R1A"
1.Create Network ${Networks[0]}
2.Create SubNet ${Networks[0]}, ${Subnets[0]}, ${Prefixes[0]}/64, --ip-version 6 --ipv6-ra-mode slaac --ipv6-address-mode slaac
3.Create Router ${Routers[0]}
4.Add Router Interface ${Routers[0]}, ${Subnets[0]}
5.Neutron Security Group Create ${SG_name[5]}
  neutron security-group-rule-create --direction egress --protocol icmpv6 --ethertype IPv6 SGCUSTOM
  neutron security-group-rule-create --direction ingress --protocol icmpv6 --ethertype IPv6 SGCUSTOM --remote-group-id 911a176c-d035-4f66-a9e9-ce582c0cdd38
  neutron security-group-rule-create --direction egress --protocol icmp --ethertype IPv4 SGCUSTOM
   neutron security-group-rule-create --direction ingress --protocol icmp --ethertype IPv4 SGCUSTOM --remote-group-id 911a176c-d035-4f66-a9e9-ce582c0cdd38
   neutron security-group-rule-create --direction egress --protocol tcp --ethertype IPv6 SGCUSTOM
   neutron security-group-rule-create --direction ingress --protocol tcp --ethertype IPv6 SGCUSTOM --remote-group-id 911a176c-d035-4f66-a9e9-ce582c0cdd38
    neutron security-group-rule-create --direction egress --protocol udp --ethertype IPv6 SGCUSTOM
    neutron security-group-rule-create --direction ingress --protocol udp --ethertype IPv6 SGCUSTOM --remote-group-id 911a176c-d035-4f66-a9e9-ce582c0cdd38
6. Create Neutron Port With Additional Params ${Networks[0]}, ${port_list[0]}, --security-group ${SG_name[5]}
7.Create Neutron Port With Additional Params ${Networks[0]}, ${port_list[1]}, --security-group ${SG_name[5]}
8.Create Neutron Port With Additional Params ${Networks[0]}, ${port_list[4]}, --security-group ${SG_name[5]}
9.Create Vm Instance With Port On Compute Node ${port_list[0]}, ${VM_list[0]}, ${TOOLS_SYSTEM_1_IP}, ${image_name[0]}
10. Create Vm Instance With Port On Compute Node ${port_list[1]}, ${VM_list[1]}, ${TOOLS_SYSTEM_1_IP}, ${image_name[0]},
11.Create Vm Instance With Port On Compute Node ${port_list[4]}, ${VM_list[4]}, ${TOOLS_SYSTEM_2_IP}, ${image_name[0]}
12.IPV6_Service.Get VM Ip Addresses From Instance Details, ${VM_list[0]}, ${Networks[0]}:
'eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::f816:3eff:fed2:ec7a prefixlen 64 scopeid 0x20<link> ether fa:16:3e:d2:ec:7a txqueuelen 1000 (Ethernet) RX packets 41 bytes 4641 (4.5 KiB) RX errors 0 dropped 39 overruns 0 frame 0 TX packets 10 bytes 1332 (1.3 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 $' does not contain '2001:db8:1234'
expected output:2001:db8:1234:0:f816:3eff:fee1:6d1b