Cannot read property 'listRegistrationsByTag' of undefined' (Azure App Services)

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UPDATE: This should be resolved shortly (as in today 3/2/2017)

Situation:

You are creating a Mobile App or Azure App Services and setting up the push notifications for the first time

Problem:

Calling Register or RegisterAsync in the client code can result in a 400 status code coming back with an inner exception of: 'Cannot read property 'listRegistrationsByTag' of undefined'

Cause:

The Portal blade does not set the Application Setting MS_NotificationHubName

Workaround:

Add MS_NotificationHubName in the Application settings.  The name will be the name of your Notification Hub.  It is the last item after the \ in the setting MS_NotificationHubId or you can get in from the notification Hub blade:

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More information:

Once this is fixed the Portal Blade will set the MS_NotificationHubName for you when you walk through the Portal setup of Push notifications.  At that time I will update this Blog!  If you need further help, you can certainly open a support case through the Azure Portal.