iCloudKV Cordova 3.7.0 with Telerik AppBuilder

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Having trouble attempting to use this plugin. Cannot rule out my stupidity :) Essentially we have an existing application in the App Store using Xamarin. We have redone the same application in Telerik AppBuilder and need to read an iCloud variable about their subscription that we set using the Xamarin version. After the DeviceReady fires, I have the following code executed:

        if (window.navigator.simulator !== true) {
            iCloudKV.sync(function(value) {
                alert("sync: " + JSON.stringify(value));
            }, function(value){
                alert("sync failure: " + value);
            });
            iCloudKV.save("testfree","boo",function (value) {
                alert("save: " + value);
            });
        }

The value is never set, and I also get a 'synchronise failed' when running the sync. When I change it from Cordova 3.7.0 to 3.5.0 to the save returns an 'OK' instead of a null value, but sync still says 'synchronise failed'. Sometimes it doesn't fail during the sync, but the value is {}

Any help would be much appreciated.