I\'m using Google\'s Firebase Cloud Messaging to send push-notifications to my iOS and Android applications. The push-notifications sent through the Cloud Messaging console
I managed to fix the problem thanks to this answer: https://stackoverflow.com/a/37550067/516338
Basically, although NOT in the documents, you have to set the "priority" field to "high" on iOS, like this:
{
"to": "cHPpZ_s14EA:APA91bG56znW...",
"priority": "high",
"notification" : {
"body" : "hello!",
"title": "afruz",
"sound": "default"
}
}