Same problem here. I cannot report bugs via the web site or the app.
Brian Greenstone
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Yep, seeing the same problem here too.
Apple seemed to have fixed most of the voice chat issues in iOS 12. The only reminaing issue is that it causes the app to momentarily lock up while the OS attempts to make the voice chat connection. The original version of GKVoiceChat never did that, but at least that's the only annoyance I still see with it. Other than that it has been working normally for me in Air Wings.-Brian
The players definitely don't need to be on the same network. It *should* work fine in any circumstances, but this is Apple we're talking about, so all bets are off. They stopped caring about Game Center a very long time ago. That being said, at least they finally fixed several cricital Game Center bugs that I reports... 5 years earlier.-Brian