Android集成FCM后无法接收推送通知求助

已花费一周时间尝试为应用集成FCM并发送测试推送通知，按官方文档、YouTube教程操作后仍无法解决问题——设备无法接收推送，Firebase控制台仅显示活动已创建且处于激活状态，不清楚是否存在错误，怀疑遗漏细节，恳请协助排查。

配置与代码详情 #

Manifest文件 #

<application> 
<service
    android:name=".service.MyFirebaseMessagingService"
    tools:ignore="Instantiatable">
    <intent-filter>
        <action android:name="com.google.firebase.MESSAGING_EVENT" />
    </intent-filter>
</service>

<meta-data
    android:name="com.google.firebase.messaging.default_notification_icon"
    android:resource="@mipmap/finsol_logo_round" />
<meta-data
    android:name="com.google.firebase.messaging.default_notification_color"
    android:resource="@color/colorPrimary" />
</application> 

服务代码（Kotlin） #

class MyFirebaseMessagingService : FirebaseMessagingService() {

    override fun onNewToken(token: String) {
        sendRegistrationToServer(token)
    }

    private fun sendRegistrationToServer(token: String?) {
        Firebase.messaging.token
        FirebaseMessaging.getInstance().token.addOnCompleteListener(OnCompleteListener { task ->
            if (!task.isSuccessful) {
                Timber.e(task.exception)
                return@OnCompleteListener
            }

            val token = task.result
            Timber.e(token)
        })
    }

    override fun onMessageReceived(remoteMessage: RemoteMessage) {
        Timber.e(remoteMessage.messageId)
        if (remoteMessage.notification != null) {
            generateNotification(remoteMessage.notification!!.title!!, remoteMessage.notification!!.body!!)
        }
    }

    private fun getRemoteView(title: String, message: String): RemoteViews {
        val remoteView = RemoteViews("br.com.finsol.finsolmobile", R.layout.notification)

        remoteView.setTextViewText(R.id.title_notification, title)
        remoteView.setTextViewText(R.id.message_notification, message)
        remoteView.setImageViewResource(R.id.logo, R.mipmap.finsol_logo_foreground)

        return remoteView
    }

    private fun generateNotification(title: String, message: String) {
        val intent = Intent(this, MainActivity::class.java)
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)

        val pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT)

        var builder: NotificationCompat.Builder = NotificationCompat.Builder(applicationContext.applicationContext, channelId)
                .setSmallIcon(R.mipmap.finsol_logo_foreground)
                .setAutoCancel(true)
                .setVibrate(longArrayOf(1000, 1000, 1000, 1000))
                .setOnlyAlertOnce(true)
                .setContentIntent(pendingIntent)

        builder.setContent(getRemoteView(title, message))

        val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val notificationChannel = NotificationChannel(channelId, channelName, NotificationManager.IMPORTANCE_HIGH)
            notificationManager.createNotificationChannel(notificationChannel)
        }

        notificationManager.notify(0, builder.build())
    }
}

额外信息与疑问 #

• 依赖与Firebase文档完全一致，当前使用Android 11系统，Tools>Firebase>Cloud Messaging菜单显示依赖配置正确。
• 怀疑是否因为是签名应用导致无法接收？已尝试添加SHA-256指纹，但不确定非上架应用是否需要该配置。
• 应用存在于Play Console项目中，Firebase是否必须与同一项目关联？这会不会是问题所在？看起来应用并未真正与Firebase关联，尽管系统显示已关联。

内容的提问来源于stack exchange，提问作者lucas_vanderlei