Trouble Sending Push Notifications

Can anyone point me in the right direction as to what I might be doing wrong. I have followed the tutorial at:

I have it set up so that when I run the app on my iPhone it initializes and registers, but when I try to send a Push Notification through the backend with the app subscribed to the channel, nothing happens.

I also added a service to send it using a master key through the app and tested it that way - when I test the service it runs successfully but still no push notifications appear nor does the label change in the app.

Is this a problem with sending or receiving the push?

Thanks in advance to anyone who can help.
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