Troubleshooting Firebase Cloud Messaging (FCM) Issues with Nagram on Samsung OneUI 6.1.1

This article addresses a specific issue encountered with Firebase Cloud Messaging (FCM) when using the Telegram-compatible third-party app Nagram on a Samsung device running OneUI 6.1.1. While FCM typically receives messages, acknowledges them, and successfully broadcasted them to the app, Nagram appears to be experiencing a blockage at the ACK stage.

The user has already confirmed their phone is not imposing background restrictions on Nagram, and Nagram is activated in the module settings. Interestingly, even whitelisting Nagram in the "NoActive" app doesn't resolve the problem. This article will explore potential causes and solutions for this FCM issue with Nagram on a Samsung device.

**Understanding the Process**
Typically, FCM follows these steps:

**Received:** FCM receives the message from the server.
**Acknowledged:** FCM acknowledges receipt of the message to the server.
**Broadcast:** FCM successfully broadcasts the message to the target app (Nagram in this case).

**Potential Causes:** The fact that FCM receives the message but doesn't acknowledge it suggests a problem within Nagram's FCM integration. Possible causes include:

**App-Specific Integration Issues:** There might be a bug or inconsistency in Nagram's implementation of the FCM API.
**Permission Conflicts:** Nagram may lack necessary permissions or be encountering conflicts with other apps related to FCM or background processes.
**Network Connectivity:** Even though general connectivity might be fine, Nagram could be experiencing intermittent network problems when attempting to acknowledge the message.
**System-Level Interference:** There could be a system-level conflict or a configuration issue on the Samsung device running OneUI 6.1.1 that is preventing Nagram from interacting with FCM properly.

**Troubleshooting Steps:**
To diagnose and rectify this issue, consider the following:

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