It seems that there are some latencies in your network, it all depends on the current responsiveness of your network.
Make sure this latter one is not doing much more than it should when you’re using our remote apps, at least over your local Wifi network.
This can especially happen if you’re running on Windows where loading the app itself tends to be a bit slower than on Mac OS. This is likely due to the communication that lays between Windows, Bonjour and your Apple device(s) which by experience seems not to be as reliable as having an entire chain made of mac devices along the network.
If after 30 seconds nothing happens, still, then we recommend you to restart both Cubase and Cubase iC Pro and try to connect again.