I would like publish my solution to the above topic.
My problem was solved when the UltraRendu could “see” the DAC.
I had changed out my USB/SPDIF convertor and didn’t realize the “new” one wasn’t functioning properly. And as a result the DAC and UltraRendu was not connected.
If the UltrRendu isn’t properly connected to the DAC then it wont show up on the network.