Thanks, I did not notice you could (or should?) declare your SMB cluster on the SMP side.
But what if you don't do it?
I only have one SMP-managed cluster, but with both 1570 gateways registered independently, rather than a "Small Office HA".
When I enabled cluster mode, it still said the cluster was managed by Cloud Services, and did not ask for a SIC key.
I had many issues with this cluster when I deployed it initially, but they were caused by the clunky connection monitoring mechanism on SMBs. Or were they?