Russound RIO MBX PRE - Unknown error occurred

I am using the Russound RIO integration and it is working flawlessly with my two MCA-88 units. However, the MBX PRE is not working at all.

It is not recognized when the integration is loaded. When I try to manually “ADD ENTRY” , I enter the IP Address and Port number and I just get an “Unknown error occurred”.

I know the IP and port numbers are correct (I am using them in another integration that works).

I have tried uninstalling and reinstalling as well as restarting.

Not sure where to go next. Any assistance would be appreciated.

This is likely the same issue as Support Russound RIO source mode · Issue #134417 · home-assistant/core · GitHub

We currently don’t support the MBX-PRE when configured to Source Mode (typical when paired with an MCA-series device). It is only supported in Zone Mode. There is no current timeline for supporting source mode, but we keep track of the status and necessary steps in the linked github issue.

Thank you for the response. The github link is very helpful. I will continue to check in and contribute where I can.