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並前往https://issues.redhat.com/browse/AGDROID-560

FirebaseInstanceID getToken() returns null on first registration

Launching an app for the first time (or after removing/deleting it from the device), the UPS registration returns a 400, since there is no token send to the ...

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查詢 「FirebaseInstanceId」的人也找了：

  1. FirebaseInstanceIdService
    2.
  2. FirebaseInstanceID' not found
    3.
  3. cannot resolve symbol 'firebaseinstanceid'
    4.
  4. unresolved reference: firebaseinstanceid
    5.
  5. subscribeToTopic
    6.
  6. Cannot find symbol: class FirebaseInstanceId
    7.
  7. FirebaseMessaging
    8.
  8. Firebase onNewToken
    9.