Perfect, thanks.
I run a Motu MK5 lite, with RPI4/Ubuntu USB, works perfectly to.
Thread is here: Motu UltraLite-mk5
It seems there are certain combinations of setups which Roon just doesn’t like.
I.e. Motu direct to Ubuntu/Roon Server, V’s using a RPI4/Ubuntu endpoint.
In saying this, Win10 works in every combination, with my MOTU running its Asio driver.