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Firebase Cloud Messaging (FCM) is a cross-platform messaging solution that allows you to reliably send messages at no cost. It supports push notifications for Android, iOS, and web applications, enabling developers to engage users by sending timely and relevant notifications.
When using FCM to send push notifications to iOS devices, you might encounter the InvalidApnsCredential error. This error indicates that there is an issue with the Apple Push Notification service (APNs) credentials configured in your Firebase project.
Notifications fail to deliver to iOS devices, and the Firebase Console or logs display an error message similar to: "InvalidApnsCredential: The APNs certificate or key is invalid or expired."
The InvalidApnsCredential error occurs when the APNs certificate or key uploaded to Firebase is either invalid or has expired. This prevents FCM from authenticating with APNs, thus blocking the delivery of push notifications to iOS devices.
To resolve the InvalidApnsCredential error, follow these steps:
Log in to your Apple Developer Account and navigate to the Certificates, Identifiers & Profiles section. Check the status of your APNs certificate or key:
Once you have a valid APNs certificate or key, update your Firebase project:
After updating the credentials, test the push notification delivery:
For more detailed guidance, refer to the official Firebase Documentation on setting up APNs credentials. Additionally, consult the Apple Developer Documentation for managing APNs certificates and keys.
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