Let’s not jump into bad conclusions here. Depending on the product ID should work. I have two roof windows connected to Homey and the remote (ZRH12). You should include the remote as a secundary controller, which is described in the manual of the remote. This makes the remote part of the same z-wave network but it won’t be visible in Homey. In short; Connect the windows to Homey and only then Connect them with the remote again, as described in the manual under secundary controller. The only thing i don’t know is if your specific remote has this function but since it’s Z-Wave it should.
Are you using the right app? Developed by Fakro.