Firebase Cloud Messaging (FCM) is a powerful tool for delivering notifications to users across various platforms. However, sometimes users encounter issues like duplicate notifications or missed messages. This article delves into common scenarios that might lead to these problems, exploring potential solutions and best practices.

One such scenario involves applications like Outlook. While an FCM notification might be correctly acknowledged by the app (visible in the FCM Diagnostics event list), Outlook's intelligent prioritization system might deem the incoming email as low priority. As a result, the notification is not displayed in the 'Focused' section, even though it has been received. In these cases, third-party tools like 'fcmfix' might bridge the gap by sending a supplementary notification.

Similarly, applications like DingTalk occasionally exhibit a quirk where users receive both FCM notifications and background messages when FCM messages are enabled. This could indicate a potential issue with the app's implementation, as it might not be effectively filtering or prioritizing messages from different sources.

Understanding these scenarios is crucial for both app developers and users seeking a seamless notification experience. By addressing these issues and adhering to best practices, we can ensure that FCM notifications deliver their intended purpose effectively.

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