Could you send me a log file, please? One of output<date-time>.log located in _logs subfolder. It should go through all connected devices and I will check why it doesn't pickup the right controller. There is no native WMR support right now. It is in plans and it may help in such cases. Although it should work fine with SteamVR (that's why I am curious to see in the log file, why it doesn't get the second controller).