How to set up Firebase Cloud Messaging via APNs using an already registered bundle identifier?

Question

The docs for setting up FCM via APNs state that you should copy the bundle identifier from your application (under the "Registering an App Identifier") section, but when I do that I get the following error when trying to register my new app id:

An attribute in the provided entity has invalid value

An App ID with Identifier '<my app id copied from xcode>' is not available. Please enter a different string.

The error message does make sense because that app id is already taken (by my app).

Are the Firebase docs wrong or am I missing something?

Answer 1

I think you can check the followings.

1. make sure if you have already checked an option for push notification on app store. go to developer.apple.com/account/resources/identifiers/list, choose your identifier in the list.
2. open your project in Xcode. and check like the below screenshot