I didn't make the cut to RA this year and moved to SPG. Took three days to get a response from AMB services if "royal ambasador requalification" means what it means.
Took less then three hours for SPG to register for a Platinum challenge.

There aren't enough ICs for me to take advantage of the status, and there really isn't any incentive to stay at other properites from the group, with benefits as opaque as RA qualification itself.