Push Notifications not delivered on Android 9.

Hey there, im following the given Doc: https://docs.expo.io/versions/latest/guides/push-notifications/ and try to get notifications to expo clients and native apps.
iOS is working fine:
Android 9 isnt working on both and push notification Tool isnt working too.
Here is my Code:

import { Notifications } from 'expo';
import * as Permissions from 'expo-permissions';
...
componentWillMount = async () => {
    await this.registerForPushNotifications(userid);
    if (Platform.OS === 'android') {
      Notifications.createChannelAndroidAsync('reminders', {
        name: 'Alarm',
        sound: true, 
        priority: 'max',
        vibrate: [0, 250, 250, 250],
      });
    }
    
    if (Platform.OS === 'android' && !Constants.isDevice) {
      this.setState({
        errorMessage: 'Oops, this will not work on Sketch in an Android emulator. Try it on your device!',
      });
    } else {
      this._getLocationAsync();
    }
...
registerForPushNotifications = async(user) => {
    const { status: existingStatus } = await Permissions.getAsync(
      Permissions.NOTIFICATIONS
    );
    let finalStatus = existingStatus;
  
    //iOS
    if (existingStatus !== 'granted') {
      const { status } = await Permissions.askAsync(Permissions.NOTIFICATIONS);
      finalStatus = status;
    }
  
    // Stop here if the user did not grant permissions
    if (finalStatus !== 'granted') {
      return;
    }
  
    // Get the token that uniquely identifies this device
    let token = await Notifications.getExpoPushTokenAsync();
    this.notificationSubscription = Notifications.addListener(this.handleNotification);
     return fetch(PUSH_ENDPOINT+user+'/'+token)
      .then((response) => response.json())
      .then((responseJson) => {
      console.log(JSON.stringify(responseJson));
      })
       .catch((error) => {
        console.error(error);
      });
  }

What happened. All Tokens are saved correctly in my Database.
Now, when im sending notifications via php only the iOS Notifications receive my Phone.
What i am missing to receive notifications on Standby devices?

php postdata:

$postData[] = array(
                "to" => $appuser->getPushtoken(),
                "title" => '🚹Einsatzalarm',
                "sound" => "default",
                "body" => 'FFFFFFFF',
                "channelId" => "alarm", // android 8.0 later
                "priority" => "high", 
            );

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