I just received my new USBridge Signature Player with Shanti power supply.
I installed RoPieee, and I can see the RoPieee web interface (it even installed a RoPieee update successfully). So, RoPieee is running, it updated itself to the latest RoPieee version, and RoPieee is accessible via the network.
I have the same version of RoPieee running on my DigiOne Signature which is playing music via Roon as I type this.
The problem is that the USBridge Signature is not visible to Roon. I restarted by Roon ROCK NUC server and that did not help. The USBridge, DigiOn