Hi - sorry for the slow reply, I was moving my studio to a new room and couldn’t use Cubase for a while.
I double checked that my username doesn’t contain any strange characters. I think I might have had a . or | in there before, so I suppose this may have been the issue - now I get a connection and I can see the performer’s video. Haven’t really tried recording anything yet, but at least there is now a connection!
Thanks for the advice!