That’s very kind of you but let me investigate a bit first.
I assume you installed the Homey-skill? I read here that it already works for switches:
Switch is not a capability in Homey, so I guess he means an onoff-capability. It could very well be that the Homey-skill does not support all capabilities, but onoff should be the first to support.
It could also be that it discovers only certain classes of devices, e.g. lights or sockets. Did you try it with those?
And here I read that the language matters, of both Alexa’s and Homey’s:
