@rhmmmm What do you mean here? The Premier takes the same digital input modules as the Reference, Select and even the entry level Discrete. Including the latest Ethernet Renderer V2. I have a Premier and I have the Ethernet Renderer in it and it works great with Roon.
you need a Roon core + Roon end point.
an MSB dac cannot work as a Roon core to my knowledge. the Core is where the music is managed. typically you would have a (1) laptop, (2) dedicated server, or (3) a NAS with it’s CPU used as the core.
i used my MSB Select II with the Renderer v2 as the Roon end point, but still used a dedicated server for the Roon core.
if you somehow used only your MSB Premier as the Roon Core + End point then where were your files, and what did your remote communicate with to change music selections? those functions are related to the Roon Core.