FCM topic - Cannot subscribe to topic: xxx with token: (null) - iOS

Question

I'm getting this error from Firebase Messaging API:

[Firebase/Messaging][I-FCM002010] Cannot subscribe to topic: /topics/testTopic with token: (null)

But before:

Messaging.messaging().subscribe(toTopic: "/topics/testTopic")

I'm printing out the token like this:

print("TOKEN: \(InstanceID.instanceID().token() ?? "NO TOKEN")")

The result is:

TOKEN:cXPhGQ_inE4:APA91bEKZF5depHmIm9gDliCFRCRcnJf5LYy5FMg6nhpWvKU3o3HEtr1WTBHUiCZXT4XzhVg2oqXzhtfrgf83brtLdqXii546644ciMPO80tri4JPueQBClKbaomEfoh54ku8E2lw

So the token isn't null.

Am I doing something wrong? Anyone some help?

I've also tested on different devices, but got the same error. — anitteb, Jun 13 '17 at 14:51
**SOLVED**. Thank you very much! The problem was that I wanted to subscribe in _didFinishLaunchingWithOptions_ but in that point not all services were setted up. The solution was to subscribe in the delegate _didRegisterUserNotificationSettings_. — anitteb, Jun 14 '17 at 07:53
I'm seeing this _sometimes_ on iOS 9.3.5, also confirming token exists. Also calling from didRegisterUserNotificationSettings. — Jonny, Sep 06 '17 at 05:29

score 6 · Accepted Answer · edited Jun 19 '18 at 08:14

6

The problem was that I wanted to subscribe in didFinishLaunchingWithOptions but in that point not all services were set up. The solution was to subscribe in the delegate didRegisterUserNotificationSettings.

edited Jun 19 '18 at 08:14

Eric Aya

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answered Jun 19 '18 at 07:55

anitteb

762
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I am doing this and still seeing this issue :( – cheesydoritosandkale May 01 '19 at 16:18

score 3 · Answer 2 · answered Mar 14 '18 at 19:44

3

In MessagingDelegate try it:

func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) {
    Messaging.messaging().subscribe(toTopic: "/topics/testTopic")
}

answered Mar 14 '18 at 19:44

dr OX

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This might also help, but I've already solved it.Thanks anyway! – anitteb Jun 19 '18 at 07:57
This method does not exist. didRefreshRegistrationToken is the proper method – Scott D Aug 21 '18 at 16:13

score 2 · Answer 3 · answered Nov 03 '18 at 20:55

2

I had similar problem. The solution was to invoke FirebaseApp.configure() first:

FirebaseApp.configure()
Messaging.messaging().delegate = self

instead of:

Messaging.messaging().delegate = self // this brakes FCM
FirebaseApp.configure()

answered Nov 03 '18 at 20:55

kam800

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score 0 · Answer 4 · answered Aug 21 '18 at 16:12

0

The most ideal place to resolve this issue is in the MessagingDelegate method didRefreshRegistrationToken.

func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String) {
   // TODO: subscribe to topics here
}

answered Aug 21 '18 at 16:12

Scott D

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FCM topic - Cannot subscribe to topic: xxx with token: (null) - iOS

4 Answers4

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