When I added the sensor it showed up as a basic Open\Close switch. It Alexa found it and it could trigger routines in Alexa.
However, I wanted it to show up as a Water Sensor instead. So I logged into Graph, went to my device, selected edit and changed the type to Z-wave Water Sensor. Relaunched the app and everything worked as expect and got the push notifications when water was detected. The only issue is that Alexa seems to be unlinked to the device now. It no longer updates and still shows as a contact sensor.
Is there a way to force the link? I tried re-discovering but it isn’t seeing the change.