While trying to stereo pair a set of roams when no internet is available the app says to check for the internet connection. This seems really strange as it should not be needed. The local system (roam in this case) should only need the wifi signal. As long as the app is connected to the same wifi it should be able to configure the speakers for stereo operation. I should clarify that I have used the system like this for some time now. It is just not reliable, meaning that sometimes I get the message stating that this operation cannot be performed and to check the internet connection.
It is really frustrating that a simple operation like this cannot be performed reliably. My old pair of Bose revolve can do this even in bluetooth mode: No wifi, no app or anything else needed.