I've got a reply from them:
"To do it with streaming in the API mode you'll need to first do the setup on computer to link the site to your device. You should be able to test there to make sure that movement commands are getting all the way to your Keon. With that working, you'll need to be logged in to the API mode (just in case you missed that, you have to log in through the HereSphere controls, if you're able to play full versions of scenes then you've got that part right). And finally, you'll have to make sure that you're playing scenes that are scripted. If you filter for "Tag: Interactive" then it should show the scenes that will work."
So I got the first part working, by linking it on my computer to FeelConnect app. But after I turn up my VR and open HereSphere, I need to connect directly to Keon from HereSphere, thus disconnecting it from FeelConnect app on my phone (and loosing the link in the process).
Am I missing something or is it just not going to work at this point?