Debugging Firebase Cloud Messaging on iOS

Debugging Firebase Cloud Messaging on iOS requires isolating failures across the delivery chain from an app server or Firebase Notifications through FCM, Apple Push Notification service (APNs), iOS, and the target app. The guide recommends first disabling explicit FCM foreground connections to avoid masking APNs issues, then adding app-delegate logging to verify APNs registration, device-token receipt, and common configuration mistakes such as simulator testing, missing push capabilities, or failure to register for remote notifications. Developers should confirm that users have granted notification permissions, test delivery directly through APNs using an HTTP/2 curl request and the correct certificate, bundle ID, and device token, and then test FCM separately using a Firebase server key and registration token. Although an FCM success response confirms message acceptance, device delivery must still be verified, with attention to token errors, iOS priority settings, proper FCM rather than APNs payload syntax, valid uploaded APNs certificates, and correct handling of silent notifications. If direct APNs and FCM tests work but Firebase Notifications or a custom server does not, the remaining investigation should focus on Firebase service status, message formatting, or server-side implementation.

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