Solution: It seems that you can assign the category that you want to relate the message:
const message = {
android:{
notification:{
title: 'Game started!',
body: 'Game '+ salaName +' has started!',
channel_id: "notification.category.default",
}
},
topic: "topicName"
};
Source: https://firebase.google.com/docs/reference/fcm/rest/v1/projects.messages#androidfcmoptions
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solved How can I set the android channel notification from code in firebase cloud function?