I may have found out something about the 1:1 NAT. Apparently the 1:1 NAT will not even try to work if the destination is not in the ARP table of the Meraki. And, in my case the destination device didn't seem to fill the ARP table in my short testing window. After trying another destination device, it started working about 24 hours where it did not initially upon setup. Very strange it takes so long to update the ARP table.
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