Unfortunately, it doesn't work. I had already recently discussed this with gigaset support, as my sensors in the basement had no reception. What mor recommended was a second account.

Well, it should be possible with an Android.
Keyword Appcloner.

I don't see any function in the app that allows you to manage multiple clients.

Gigaset Support has made improvements here. Since 2020, it has been possible to manage two stations in one account. My two stations are connected to the same network and can be controlled from one account. I cannot judge whether it works if the stations are in a different network.

I'm sorry. I don't know.