Troubleshooting Firebase Cloud Messaging (FCM) Issues on Xiaomi 14 Pro with HyperOS

The Xiaomi 14 Pro, running HyperOS 1.0.23.11.21.Dev and Android 14, seems to be experiencing issues with Firebase Cloud Messaging (FCM) despite having the fcm module enabled. Despite enabling the 'unlock cn gms' module, many apps that support FCM are not receiving notifications. This issue appears specific to the Xiaomi 14 Pro, as a similar setup on a Xiaomi 13 Pro with the same HyperOS and Android 14 versions functions correctly.

This troubleshooting guide aims to investigate the root cause of the problem and explore potential solutions for receiving notifications reliably on the Xiaomi 14 Pro.

**Possible causes and solutions:**

* **Permissions:** Re-check if all apps requiring push notifications have the necessary permissions granted, especially for background activity and notification access. Existing permissions might be revoked due to a software update or device settings change.
* **Device restrictions:** HyperOS might have implemented specific restrictions on background activity or push notifications that interfere with FCM. Investigate device settings for any limitations related to background apps or notification handling.
* **Specific app configurations:** Some apps might not be compatible with the current HyperOS and Android 14 versions. Reach out to the app developers to check for known issues or updates.
* **Third-party security software:** Anti-virus or other security apps could be blocking FCM notifications. Temporarily disable these apps to see if it resolves the issue.
* **Server-side issues:** It is possible that the issue lies on the server-side, preventing FCM from delivering notifications properly. Contact the Firebase platform support to rule out any server-side problems.

**Debugging steps:**

* **Check Firebase console:** Verify that the FCM settings are correctly configured in your Firebase project.
* **Use Firebase Diagnostics:** The Firebase SDK provides tools for debugging FCM issues. Utilize these tools to diagnose the problem and identify any specific errors.
* **Log FCM events:** Implement logging within your app to track FCM events, such as message reception and delivery failures. This can help pinpoint the stage where the issue occurs.

By systematically investigating these potential causes and following the debugging steps, hopefully, you can restore proper FCM functionality on your Xiaomi 14 Pro.

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