FCM Push notifications do not work on iOS 11

Question

I use Firebase as a backend. I also use FCM as one of the provided features from Firebase. FCM worked well in iOS 10, but after switching to iOS 11, push notifications stopp

Answer 1

Seems to be an issue with Firebase SDK where push notifications stop working after app relaunch or when killed. A work around for this was suggested:

let deleteCount = UserDefaults.standard.integer(forKey: "oneTimeWorkaroundKey")
        if deleteCount == 0 {
            InstanceID.instanceID().deleteID { error in
                if let cError = error {
                    log("APNS: Error on delete: \(cError)")
                } else {
                    UserDefaults.standard.set(deleteCount + 1, forKey: "oneTimeWorkaroundKey")
                }
            }
        } 

Heres a link to see the discussions held about this, one case is still open trying to resolve this issue https://github.com/firebase/firebase-ios-sdk/issues/2438