[Flutter] Flutter Firebase FCM notification always a white/grey square rather than the custom...

Tried all the advice from Stackoverflow, but didn't make any difference: Put this into the AndroidManifest

<application
android:name="io.flutter.app.FlutterApplication"
android:label="Honest"
android:icon="@mipmap/ic_launcher">
<!-- Set custom default icon. This is used when no icon is set for incoming notification messages. -->
<meta-data
android:name="com.google.firebase.messaging.default_notification_icon"
android:resource="@drawable/ic_stat_ic_notification" />
<!-- Set color used with incoming notification messages. This is used when no color is set for the incoming notification message. -->
<meta-data
android:name="com.google.firebase.messaging.default_notification_color"
android:resource="@color/colorAccent" />
<activity


Then tried putting the ic notification in different folders - no difference! And putting the png icon into drawables folder directly... Played with vector and png - nothing works... still the same grey square...

The res folder looks as follows:

│ ├── launch_background.xml
│ └── orange_tick.xml

├── drawable-hdpi
│ ├── ic_stat_ic_notification.png
│ └── ic_stat_notification.png

├── drawable-mdpi
│ ├── ic_stat_ic_notification.png
│ └── ic_stat_notification.png

├── drawable-xhdpi
│ ├── ic_stat_ic_notification.png
│ └── ic_stat_notification.png

├── drawable-xxhdpi
│ ├── ic_stat_ic_notification.png
│ └── ic_stat_notification.png

├── drawable-xxxhdpi
│ ├── ic_stat_ic_notification.png
│ └── ic_stat_notification.png

├── mipmap-hdpi
│ └── ic_launcher.png
├── mipmap-mdpi
│ └── ic_launcher.png
├── mipmap-xhdpi
│ └── ic_launcher.png
├── mipmap-xxhdpi
│ └── ic_launcher.png
├── mipmap-xxxhdpi
│ └── ic_launcher.png
└── values
├── colors.xml
├── strings.xml
└── styles.xml


Anyone spots what I'm doing wrong that it doesn't work would be super!!

Flutter doctor all clean, the android device is a Ulefone Power 2 with Android 7.0 if that makes any difference...

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