Official Alexa Smart Home Skill for openHAB 2

I’m having trouble getting Alexa to recognise my items. I’ve registered Alexa with myopenhab. I’ve also rulled out the potential network issue with my controller plugged directly into my wifi router. I’ve added a rule to update the Dummy items and can see them the values set in the logs. Here’s an extract from my .items file with the tagged items.

Group gTempSensor [ "Thermostat" ]    
Number    sensor_temperature2 "Garage Temp: [%.1f °C]"   <temperature>   (gChart,gRestore,gSensors,gTempSensor)   [ "CurrentTemperature" ]
Number    Dummy_Target         "Not used"     (gTempSensor)   [ "TargetTemperature" ]
String    Dummy_CoolingMode   "Not used"     (gTempSensor)                                           [ "homekit:HeatingCoolingMode" ]
Switch    zwave_device_8527f2c0_node2_switch_binary       "Study Light"   <light>  (gLights)   [ "Switchable" ]

I can see my tagged items in the REST API

{
    "link": "http://10.1.1.102:8080/rest/items/zwave_device_8527f2c0_node2_switch_binary",
    "state": "ON",
    "type": "Switch",
    "name": "zwave_device_8527f2c0_node2_switch_binary",
    "label": "Study Light",
    "category": "light",
    "tags": [
      "Switchable"
    ],
    "groupNames": [
      "gLights"
    ]
  }

Anything obvious i’m doing wrong?