We got this semi-sorted by restricting target ifaces to those in a SC zone.  There are a couple of possibilities as far as why this was needed, but since this is a demo and not production we didn't pursue.
Two clusters on the same subnet and domain, both members of the domain, both accessible in all normal manners, But SyncIQ is failing:   SyncIQ is unable to connect to a resource on the target cluster.  Used ping to determine if target is reachable.  Verified that SyncIQ is licensed and enabled on the target cluster, and that the SyncIQ daemons are running.  Error from remote sworker 10.7.153.50: Local cluster has no external IP addresses     The policy is targeting the SmartConnect Name, which is pingable from that cluster.      Thoughts???
SyncIQ networking problem