I have unsuccessfully been trying to get the following use case to work today:
Sony Xperia XZ1 compact with Android 8 and Roon app
Chord Mojo connected to XZ1 via OTC cable
The roon android app finds my ROCK and I can play files locally on the phone, but it will not find the Mojo.
The Chord Mojo works fine on the XZ1 using USB Audio Player Pro (with the same OTC cable), so the basic setup seems to function.
Does the roon android app not recognize USB devices connected to a phone / tablet using an OTC cable?