I'm also suffering from this issue. NSApp.isRegisteredForRemoteNotifications is also true for me. When the entitlements weren't set up, I was getting didFailToRegisterForRemoteNotificationsWithError, but after configuring that, I simply get nothing.
FrostyBagg
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If none of the above works, download the WWDR Intermediate Certificate - https://www.apple.com/certificateauthority/AppleWWDRCAG3.cer and drag and drop into your 'System' keychain. Don't put it in 'login' - I tried that myself and it did nothing to help me. Try to avoid changing the trust settings of your certificates, Xcode gave me a warning when it saw I had modified my development certificate's trust settings.