@timmo
Also no help here, just the information that I still have the same issue with my EU Galaxy Note 10 plus since Roon update in May.
So finally I bought a used LG V30 at the end of July, which I use just as a WiFi remote without a SIM card and exclusively for Roon.
: (( I also considered a LG V20, like yours, which luckily I didn’t buy :))) … imagine that:
Buying an additional phone that I don’t actually need because I already have a really good one - that just doesn’t work with Roon.
And the phone that I 'm buying now might not work after the next Roon update either?!
It certainly makes sense to move the whole thing into the support section so that it can be seen by @support.