Oh, right - I think this is actually a problem that happens because of our FCM usage - we auto subscribe all the devices to a FCM topic,
hence the "receive" checkbox is ignored - we have no control over it.

I think we might just remove the checkbox, or give some context, that this is only working when using a "none-FCM" criteria (e.g. alias):
https://github.com/aerogear/aerogear-unifiedpush-server/blob/master/push/sender/src/main/java/org/jboss/aerogear/unifiedpush/message/token/TokenLoaderUtils.java#L82

So, if you have two devices, both have the same alias, and you use the alias for sending, the receiving checkbox works