Colorsource Relay RDM on a Pathport Uno gateway

Has anyone used Colorsource Relays with Pathway Connectivity Pathport Uno gateways and been able to get RDM to work?   The gateway reports "None found" when I tell it to Find RDM Devices, but the Relay RDM works if I connect it to an Ion.  Both the Relay and the Uno are on the latest firmware.  Could there be compatibility issues at the RDM level?  Thanks.

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