I’m frustrated

Can't subscribe to topics on ios (Error Domain=com.google.fcm Code=5) ionic3?

Hi team,
I got the above error when launch the app in simulator only splash is showing continue.

Tried solution:

After add below field in my info.plist file but not working any idea?

FirebaseAppDelegateProxyEnabled: YES

I tried but worked for me,tell me how to fix?
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