In SGOS 126.96.36.199 and higher, the Management Console supports the configuration of IPv6 failover groups (SGRP).
In earlier SGOS versions (6.2.4 and 6.2.5), you need to use the CLI to configure IPv6 failover groups.
#(config) virtual-ip address IPV6-address
#(config failover)create IPV6-address
Or use IPv4 addresses for failover groups.