I am sorry to hear about the issue you are experiencing and I can fully understand your frustration with this matter. We are eager to help you investigate the issue on your side and resolve it. We appreciate your ongoing cooperation and the information you are providing.
We verified the logs for the notification Ids you provided. According to them - 2c183420-55db-11e4-b869-d73fc06d4ecb
were both sent without any problems to 4 devices - yet this does not mean that they were delivered to the respective devices, but means that they were sent to the vendor-specific servers (Apple Push Notifications Service for iOS and Google Cloud Messaging for Android) which account for delivering them to devices. That is why I will again ask you for a little bit more information about the issue. Could you please elaborate on the following:
- Are notifications sent via the "Broadcast" option delivered to all devices?
- Is there any difference if the application is in the foreground/background - I'd suggest that you put the app in the background on all testing devices and send a notification to all of them. If the delivery is successful - continue with the app in foreground (note that you need to enable the notifications again on the device and update the device's registration when the app is cold-started).
- Could you confirm that the following behavior persists - a device that does not receive the notification broadcasted to all yet receives the notification specifically targeted to it in a near moment in time?
- Could you observe a certain pattern connected to the devices' platform, OS version, etc.
Unfortunately, until we are not equipped with enough information to reproduce the issue locally, we cannot be exactly specific about the root cause of it and the resolution. Once again I'd like to thank you for your cooperation and patience. I look forward to your reply.