when I open the Gateway view in an environment I am getting the following message: You can't install a gateway in this environment. Switch to the default environment or another environment that supports gateways.
Does it mean that I can only use a gateway (which is required to connect to On Premise resources) in a default environment?
How can I create an app in a non-default environment with a connection to an On Premise resource?
From the documentation I sent you before we know that we can only use a gateway in default environment currently. So it might not be possible to create an app in a non-default environment with a connection to On-Premise resource.