一、报错信息

2021-10-26 11:32:12.528 21732-21847/com.techwall.myapplication E/FirebaseMessaging: Failed to get FIS auth token
    java.util.concurrent.ExecutionException: com.google.firebase.installations.FirebaseInstallationsException: Firebase Installations Service is unavailable. Please try again later.
        at com.google.android.gms.tasks.Tasks.zzb(Unknown Source:61)
        at com.google.android.gms.tasks.Tasks.await(Unknown Source:23)
        at com.google.firebase.messaging.GmsRpc.setDefaultAttributesToBundle(com.google.firebase:firebase-messaging@@22.0.0:11)
        at com.google.firebase.messaging.GmsRpc.startRpc(com.google.firebase:firebase-messaging@@22.0.0:1)
        at com.google.firebase.messaging.GmsRpc.getToken(com.google.firebase:firebase-messaging@@22.0.0:2)
        at com.google.firebase.messaging.FirebaseMessaging.lambda$blockingGetToken$8$FirebaseMessaging(com.google.firebase:firebase-messaging@@22.0.0:1)
        at com.google.firebase.messaging.FirebaseMessaging$$Lambda$9.start(Unknown Source:4)
        at com.google.firebase.messaging.RequestDeduplicator.getOrStartGetTokenRequest(com.google.firebase:firebase-messaging@@22.0.0:6)
        at com.google.firebase.messaging.FirebaseMessaging.lambda$blockingGetToken$9$FirebaseMessaging(com.google.firebase:firebase-messaging@@22.0.0:1)
        at com.google.firebase.messaging.FirebaseMessaging$$Lambda$8.then(Unknown Source:4)
        at com.google.android.gms.tasks.zzf.run(Unknown Source:2)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at com.google.android.gms.common.util.concurrent.zza.run(Unknown Source:6)
        at java.lang.Thread.run(Thread.java:929)
     Caused by: com.google.firebase.installations.FirebaseInstallationsException: Firebase Installations Service is unavailable. Please try again later.
        at com.google.firebase.installations.remote.FirebaseInstallationServiceClient.createFirebaseInstallation(FirebaseInstallationServiceClient.java:213)
        at com.google.firebase.installations.FirebaseInstallations.registerFidWithServer(FirebaseInstallations.java:533)
        at com.google.firebase.installations.FirebaseInstallations.doNetworkCallIfNecessary(FirebaseInstallations.java:388)
        at com.google.firebase.installations.FirebaseInstallations.lambda$doRegistrationOrRefresh$2$FirebaseInstallations(FirebaseInstallations.java:377)
        at com.google.firebase.installations.-$$Lambda$FirebaseInstallations$VZq1h0TBcWNH8Y5yY86ujrFFyLo.run(Unknown Source:4)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:929) 

二、解决问题

1、Firebase安装服务需要开启VPN！！！